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Class: Date

Relationships & Source Files
Namespace Children
Classes:
Infinity
Exceptions:
Error
Extension / Inclusion / Inheritance Descendants
Subclasses:
DateTime
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, Comparable
Inherits: Object
Defined in: ext/date/date_core.c,
ext/date/lib/date.rb

Overview

Class Date provides methods for storing and manipulating calendar dates.

Consider using class Time instead of class Date if:

  • You need both dates and times; Date handles only dates.

  • You need only Gregorian dates (and not Julian dates); see Julian and Gregorian Calendars.

A Date object, once created, is immutable, and cannot be modified.

Creating a Date

You can create a date for the current date, using .today:

Date.today # => #<Date: 1999-12-31>

You can create a specific date from various combinations of arguments:

  • .new takes integer year, month, and day-of-month:

    Date.new(1999, 12, 31) # => #<Date: 1999-12-31>

  • .ordinal takes integer year and day-of-year:

    Date.ordinal(1999, 365) # => #<Date: 1999-12-31>

  • .jd takes integer Julian day:

    Date.jd(2451544) # => #<Date: 1999-12-31>

  • .commercial takes integer commercial data (year, week, day-of-week):

    Date.commercial(1999, 52, 5) # => #<Date: 1999-12-31>

  • .parse takes a string, which it parses heuristically:

    Date.parse('1999-12-31')    # => #<Date: 1999-12-31>
Date.parse('31-12-1999')    # => #<Date: 1999-12-31>
Date.parse('1999-365')      # => #<Date: 1999-12-31>
Date.parse('1999-W52-5')    # => #<Date: 1999-12-31>

  • .strptime takes a date string and a format string, then parses the date string according to the format string:

    Date.strptime('1999-12-31', '%Y-%m-%d')  # => #<Date: 1999-12-31>
Date.strptime('31-12-1999', '%d-%m-%Y')  # => #<Date: 1999-12-31>
Date.strptime('1999-365', '%Y-%j')       # => #<Date: 1999-12-31>
Date.strptime('1999-W52-5', '%G-W%V-%u') # => #<Date: 1999-12-31>
Date.strptime('1999 52 5', '%Y %U %w')   # => #<Date: 1999-12-31>
Date.strptime('1999 52 5', '%Y %W %u')   # => #<Date: 1999-12-31>
Date.strptime('fri31dec99', '%a%d%b%y')  # => #<Date: 1999-12-31>

See also the specialized methods in “Specialized Format Strings” in Formats for s and Times

Argument limit

Certain singleton methods in Date that parse string arguments also take optional keyword argument limit, which can limit the length of the string argument.

When limit is:

  • Non-negative: raises ArgumentError if the string length is greater than limit.

  • Other numeric or nil: ignores limit.

  • Other non-numeric: raises TypeError.

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(year = -4712, month = 1, mday = 1, start = Date::ITALY) ⇒ Date

Returns a new Date object constructed from the given arguments:

Date.new(2022).to_s        # => "2022-01-01"
Date.new(2022, 2).to_s     # => "2022-02-01"
Date.new(2022, 2, 4).to_s  # => "2022-02-04"

Argument #month should be in range (1..12) or range (-12..-1); when the argument is negative, counts backward from the end of the year:

Date.new(2022, -11, 4).to_s # => "2022-02-04"

Argument #mday should be in range (1..n) or range (-n..-1) where n is the number of days in the month; when the argument is negative, counts backward from the end of the month.

See argument start.

.civil is an alias for new.

Related: .jd.

[ GitHub ] 

  


# File 'ext/date/date_core.c', line 3500



static VALUE
date_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE vy, vm, vd, vsg, y, fr, fr2, ret;
    int m, d;
    double sg;
    struct SimpleDateData *dat = rb_check_typeddata(self, &d_lite_type);

    if (!simple_dat_p(dat)) {
	rb_raise(rb_eTypeError, "Date expected");
    }

    rb_scan_args(argc, argv, "04", &vy, &vm, &vd, &vsg);

    y = INT2FIX(-4712);
    m = 1;
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 4:
	val2sg(vsg, sg);
      case 3:
        check_numeric(vd, "day");
	num2int_with_frac(d, positive_inf);
      case 2:
        check_numeric(vm, "month");
	m = NUM2INT(vm);
      case 1:
        check_numeric(vy, "year");
	y = vy;
    }

    if (guess_style(y, sg) < 0) {
	VALUE nth;
	int ry, rm, rd;

	if (!valid_gregorian_p(y, m, d,
			       &nth, &ry,
			       &rm, &rd))
	    rb_raise(eDateError, "invalid date");

	set_to_simple(self, dat, nth, 0, sg, ry, rm, rd, HAVE_CIVIL);
    }
    else {
	VALUE nth;
	int ry, rm, rd, rjd, ns;

	if (!valid_civil_p(y, m, d, sg,
			   &nth, &ry,
			   &rm, &rd, &rjd,
			   &ns))
	    rb_raise(eDateError, "invalid date");

	set_to_simple(self, dat, nth, rjd, sg, ry, rm, rd, HAVE_JD | HAVE_CIVIL);
    }
    ret = self;
    add_frac();
    return ret;
}


  







Class Method Details



  

    ._httpdate(string, limit: 128)  ⇒ Hash   



  

    

Returns a hash of values parsed from string, which should be a valid HTTP date format:



d = Date.new(2001, 2, 3)
s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"
Date._httpdate(s)
# => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"GMT", :offset=>0}



Related: .httpdate (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4909



static VALUE
date_s__httpdate(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__httpdate(str);
}


  








  

    ._iso8601(string, limit: 128)  ⇒ Hash   



  

    

Returns a hash of values parsed from string, which should contain an ISO 8601 formatted date:



d = Date.new(2001, 2, 3)
s = d.iso8601    # => "2001-02-03"
Date._iso8601(s) # => {:mday=>3, :year=>2001, :mon=>2}



See argument limit.



Related: .iso8601 (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4626



static VALUE
date_s__iso8601(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__iso8601(str);
}


  








  

    ._jisx0301(string, limit: 128)  ⇒ Hash   



  

    

Returns a hash of values parsed from string, which should be a valid JIS X 0301 date format:



d = Date.new(2001, 2, 3)
s = d.jisx0301    # => "H13.02.03"
Date._jisx0301(s) # => {:year=>2001, :mon=>2, :mday=>3}



See argument limit.



Related: .jisx0301 (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4978



static VALUE
date_s__jisx0301(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__jisx0301(str);
}


  








  

    ._load(s)  
  

  

    This method is for internal use only.
  

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# File 'ext/date/date_core.c', line 7654



static VALUE
date_s__load(VALUE klass, VALUE s)
{
    VALUE a, obj;

    a = rb_marshal_load(s);
    obj = d_lite_s_alloc(klass);
    return d_lite_marshal_load(obj, a);
}


  








  

    ._parse(string, comp = true, limit: 128)  ⇒ Hash   



  

    

Note: This method recognizes many forms in string, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times



If string does not specify a valid date, the result is unpredictable; consider using ._strptime instead.



Returns a hash of values parsed from string:



Date._parse('2001-02-03') # => {:year=>2001, :mon=>2, :mday=>3}



If comp is true and the given year is in the range (0..99), the current century is supplied; otherwise, the year is taken as given:



Date._parse('01-02-03', true)  # => {:year=>2001, :mon=>2, :mday=>3}
Date._parse('01-02-03', false) # => {:year=>1, :mon=>2, :mday=>3}



See argument limit.



Related: .parse(returns a Date object).


  



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# File 'ext/date/date_core.c', line 4537



static VALUE
date_s__parse(int argc, VALUE *argv, VALUE klass)
{
    return date_s__parse_internal(argc, argv, klass);
}


  








  

    

      ._rfc822(string, limit: 128)  ⇒ Hash 
      ._rfc2822(string, limit: 128)  ⇒ Hash 
    

  



  

    

Alias for ._rfc822.


  





  








  

    ._rfc3339(string, limit: 128)  ⇒ Hash   



  

    

Returns a hash of values parsed from string, which should be a valid RFC 3339 format:



d = Date.new(2001, 2, 3)
s = d.rfc3339     # => "2001-02-03T00:00:00+00:00"
Date._rfc3339(s)
# => {:year=>2001, :mon=>2, :mday=>3, :hour=>0, :min=>0, :sec=>0, :zone=>"+00:00", :offset=>0}



See argument limit.



Related: .rfc3339 (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4697



static VALUE
date_s__rfc3339(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__rfc3339(str);
}


  








  

    ._rfc822(string, limit: 128)  ⇒ Hash     Also known as: ._rfc2822
  



  

    

Returns a hash of values parsed from string, which should be a valid RFC 2822 date format:



d = Date.new(2001, 2, 3)
s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date._rfc2822(s)
# => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"+0000", :offset=>0}



See argument limit.



_rfc822 is an alias for ._rfc2822.



Related: .rfc2822 (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4839



static VALUE
date_s__rfc2822(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__rfc2822(str);
}


  








  

    ._strptime(string, format = '%F')  ⇒ Hash   



  

    

Returns a hash of values parsed from string according to the given format:



Date._strptime('2001-02-03', '%Y-%m-%d') # => {:year=>2001, :mon=>2, :mday=>3}



For other formats, see Formats for Dates and Times. (Unlike #strftime, does not support flags and width.)



See also strptime(3).



Related: .strptime (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4394



static VALUE
date_s__strptime(int argc, VALUE *argv, VALUE klass)
{
    return date_s__strptime_internal(argc, argv, klass, "%F");
}


  








  

    ._xmlschema(string, limit: 128)  ⇒ Hash   



  

    

Returns a hash of values parsed from string, which should be a valid XML date format:



d = Date.new(2001, 2, 3)
s = d.xmlschema    # => "2001-02-03"
Date._xmlschema(s) # => {:year=>2001, :mon=>2, :mday=>3}



See argument limit.



Related: .xmlschema (returns a Date object).


  



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# File 'ext/date/date_core.c', line 4767



static VALUE
date_s__xmlschema(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__xmlschema(str);
}


  








  

    .civil(*args)  
  



  

    

Same as .new.


  



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# File 'ext/date/date_core.c', line 3469



static VALUE
date_s_civil(int argc, VALUE *argv, VALUE klass)
{
    return date_initialize(argc, argv, d_lite_s_alloc_simple(klass));
}


  








  

    .commercial(cwyear = -4712, cweek = 1, cwday = 1, start = Date::ITALY)  ⇒ Date   



  

    

Returns a new Date object constructed from the arguments.



Argument #cwyear gives the year, and should be an integer.



Argument #cweek gives the index of the week within the year, and should be in range (1..53) or (-53..-1); in some years, 53 or -53 will be out-of-range; if negative, counts backward from the end of the year:



Date.commercial(2022, 1, 1).to_s  # => "2022-01-03"
Date.commercial(2022, 52, 1).to_s # => "2022-12-26"



Argument #cwday gives the indes of the weekday within the week, and should be in range (1..7) or (-7..-1); 1 or -7 is Monday; if negative, counts backward from the end of the week:



Date.commercial(2022, 1, 1).to_s  # => "2022-01-03"
Date.commercial(2022, 1, -7).to_s # => "2022-01-03"



When #cweek is 1:


  • 

    If January 1 is a Friday, Saturday, or Sunday, the first week begins in the week after:
    


    Date::ABBR_DAYNAMES[Date.new(2023, 1, 1).wday] # => "Sun"
Date.commercial(2023, 1, 1).to_s # => "2023-01-02"
  Date.commercial(2023, 1, 7).to_s # => "2023-01-08"
    

  • 

    Otherwise, the first week is the week of January 1, which may mean some of the days fall on the year before:
    


    Date::ABBR_DAYNAMES[Date.new(2020, 1, 1).wday] # => "Wed"
Date.commercial(2020, 1, 1).to_s # => "2019-12-30"
  Date.commercial(2020, 1, 7).to_s # => "2020-01-05"
    




See argument start.



Related: .jd, .new, .ordinal.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 3606



static VALUE
date_s_commercial(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vw, vd, vsg, y, fr, fr2, ret;
    int w, d;
    double sg;

    rb_scan_args(argc, argv, "04", &vy, &vw, &vd, &vsg);

    y = INT2FIX(-4712);
    w = 1;
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 4:
	val2sg(vsg, sg);
      case 3:
        check_numeric(vd, "cwday");
	num2int_with_frac(d, positive_inf);
      case 2:
        check_numeric(vw, "cweek");
	w = NUM2INT(vw);
      case 1:
        check_numeric(vy, "year");
	y = vy;
    }

    {
	VALUE nth;
	int ry, rw, rd, rjd, ns;

	if (!valid_commercial_p(y, w, d, sg,
				&nth, &ry,
				&rw, &rd, &rjd,
				&ns))
	    rb_raise(eDateError, "invalid date");

	ret = d_simple_new_internal(klass,
				    nth, rjd,
				    sg,
				    0, 0, 0,
				    HAVE_JD);
    }
    add_frac();
    return ret;
}


  








  

    

      .leap?(year)  ⇒ Boolean 
      .gregorian_leap?(year)  ⇒ Boolean 
    

  



  

    

Alias for .leap?.


  





  








  

    .httpdate(string = 'Mon, 01 Jan -4712 00:00:00 GMT', start = Date::ITALY, limit: 128)  ⇒ Date   



  

    

Returns a new Date object with values parsed from string, which should be a valid HTTP date format:



d = Date.new(2001, 2, 3)
  s = d.httpdate   # => "Sat, 03 Feb 2001 00:00:00 GMT"
  Date.httpdate(s) # => #<Date: 2001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




Related: ._httpdate (returns a hash).


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 4939



static VALUE
date_s_httpdate(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);

    switch (argc) {
      case 0:
	str = rb_str_new2("Mon, 01 Jan -4712 00:00:00 GMT");
      case 1:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__httpdate(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    .iso8601(string = '-4712-01-01', start = Date::ITALY, limit: 128)  ⇒ Date   



  

    

Returns a new Date object with values parsed from string, which should contain an ISO 8601 formatted date:



d = Date.new(2001, 2, 3)
s = d.iso8601   # => "2001-02-03"
Date.iso8601(s) # => #<Date: 2001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




Related: ._iso8601 (returns a hash).


  



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# File 'ext/date/date_core.c', line 4656



static VALUE
date_s_iso8601(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
	str = rb_str_new2("-4712-01-01");
      case 1:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__iso8601(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    .jd(jd = 0, start = Date::ITALY)  ⇒ Date   



  

    

Returns a new Date object formed from the arguments:



Date.jd(2451944).to_s # => "2001-02-03"
Date.jd(2451945).to_s # => "2001-02-04"
Date.jd(0).to_s       # => "-4712-01-01"



The returned date is:




See argument start.



Related: .new.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 3356



static VALUE
date_s_jd(int argc, VALUE *argv, VALUE klass)
{
    VALUE vjd, vsg, jd, fr, fr2, ret;
    double sg;

    rb_scan_args(argc, argv, "02", &vjd, &vsg);

    jd = INT2FIX(0);
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 2:
	val2sg(vsg, sg);
      case 1:
        check_numeric(vjd, "jd");
	num2num_with_frac(jd, positive_inf);
    }

    {
	VALUE nth;
	int rjd;

	decode_jd(jd, &nth, &rjd);
	ret = d_simple_new_internal(klass,
				    nth, rjd,
				    sg,
				    0, 0, 0,
				    HAVE_JD);
    }
    add_frac();
    return ret;
}


  








  

    .jisx0301(string = '-4712-01-01', start = Date::ITALY, limit: 128)  ⇒ Date   



  

    

Returns a new Date object with values parsed from string, which should be a valid JIS X 0301 format:



d = Date.new(2001, 2, 3)
s = d.jisx0301   # => "H13.02.03"
Date.jisx0301(s) # => #<Date: 2001-02-03>



For no-era year, legacy format, Heisei is assumed.



Date.jisx0301('13.02.03') # => #<Date: 2001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




Related: ._jisx0301 (returns a hash).


  



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# File 'ext/date/date_core.c', line 5011



static VALUE
date_s_jisx0301(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
	str = rb_str_new2("-4712-01-01");
      case 1:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__jisx0301(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    .julian_leap?(year)  ⇒ Boolean   



  

    

Returns true if the given year is a leap year in the proleptic Julian calendar, false otherwise:



Date.julian_leap?(1900) # => true
Date.julian_leap?(1901) # => false



Related: .gregorian_leap?.


  



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# File 'ext/date/date_core.c', line 2968



static VALUE
date_s_julian_leap_p(VALUE klass, VALUE y)
{
    VALUE nth;
    int ry;

    check_numeric(y, "year");
    decode_year(y, +1, &nth, &ry);
    return f_boolcast(c_julian_leap_p(ry));
}


  








  

    .leap?(year)  ⇒ Boolean     Also known as: .gregorian_leap?
  



  

    

Returns true if the given year is a leap year in the proleptic Gregorian calendar, false otherwise:



Date.gregorian_leap?(2000) # => true
Date.gregorian_leap?(2001) # => false



leap? is an alias for .gregorian_leap?.



Related: .julian_leap?.


  



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# File 'ext/date/date_core.c', line 2993



static VALUE
date_s_gregorian_leap_p(VALUE klass, VALUE y)
{
    VALUE nth;
    int ry;

    check_numeric(y, "year");
    decode_year(y, -1, &nth, &ry);
    return f_boolcast(c_gregorian_leap_p(ry));
}


  








  

    .new!(*args)  
  

  

    This method is for internal use only.
  

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# File 'ext/date/date_core.c', line 3145



static VALUE
date_s_new_bang(int argc, VALUE *argv, VALUE klass)
{
    VALUE ajd, of, sg, nth, sf;
    int jd, df, rof;
    double rsg;

    rb_scan_args(argc, argv, "03", &ajd, &of, &sg);

    switch (argc) {
      case 0:
	ajd = INT2FIX(0);
      case 1:
	of = INT2FIX(0);
      case 2:
	sg = INT2FIX(DEFAULT_SG);
    }

    old_to_new(ajd, of, sg,
	       &nth, &jd, &df, &sf, &rof, &rsg);

    if (!df && f_zero_p(sf) && !rof)
	return d_simple_new_internal(klass,
				     nth, jd,
				     rsg,
				     0, 0, 0,
				     HAVE_JD);
    else
	return d_complex_new_internal(klass,
				      nth, jd,
				      df, sf,
				      rof, rsg,
				      0, 0, 0,
				      0, 0, 0,
				      HAVE_JD | HAVE_DF);
}


  








  

    .nth_kday(*args)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 3707



static VALUE
date_s_nth_kday(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vm, vn, vk, vsg, y, fr, fr2, ret;
    int m, n, k;
    double sg;

    rb_scan_args(argc, argv, "05", &vy, &vm, &vn, &vk, &vsg);

    y = INT2FIX(-4712);
    m = 1;
    n = 1;
    k = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 5:
	val2sg(vsg, sg);
      case 4:
	num2int_with_frac(k, positive_inf);
      case 3:
	n = NUM2INT(vn);
      case 2:
	m = NUM2INT(vm);
      case 1:
	y = vy;
    }

    {
	VALUE nth;
	int ry, rm, rn, rk, rjd, ns;

	if (!valid_nth_kday_p(y, m, n, k, sg,
			      &nth, &ry,
			      &rm, &rn, &rk, &rjd,
			      &ns))
	    rb_raise(eDateError, "invalid date");

	ret = d_simple_new_internal(klass,
				    nth, rjd,
				    sg,
				    0, 0, 0,
				    HAVE_JD);
    }
    add_frac();
    return ret;
}


  








  

    .ordinal(year = -4712, yday = 1, start = Date::ITALY)  ⇒ Date   



  

    

Returns a new Date object formed fom the arguments.



With no arguments, returns the date for January 1, -4712:



Date.ordinal.to_s # => "-4712-01-01"



With argument #year, returns the date for January 1 of that year:



Date.ordinal(2001).to_s  # => "2001-01-01"
Date.ordinal(-2001).to_s # => "-2001-01-01"



With positive argument #yday == n, returns the date for the nth day of the given year:



Date.ordinal(2001, 14).to_s # => "2001-01-14"



With negative argument #yday, counts backward from the end of the year:



Date.ordinal(2001, -14).to_s # => "2001-12-18"



Raises an exception if #yday is zero or out of range.



See argument start.



Related: .jd, .new.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 3421



static VALUE
date_s_ordinal(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vd, vsg, y, fr, fr2, ret;
    int d;
    double sg;

    rb_scan_args(argc, argv, "03", &vy, &vd, &vsg);

    y = INT2FIX(-4712);
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 3:
	val2sg(vsg, sg);
      case 2:
        check_numeric(vd, "yday");
	num2int_with_frac(d, positive_inf);
      case 1:
        check_numeric(vy, "year");
	y = vy;
    }

    {
	VALUE nth;
	int ry, rd, rjd, ns;

	if (!valid_ordinal_p(y, d, sg,
			     &nth, &ry,
			     &rd, &rjd,
			     &ns))
	    rb_raise(eDateError, "invalid date");

	ret = d_simple_new_internal(klass,
				     nth, rjd,
				     sg,
				     0, 0, 0,
				     HAVE_JD);
    }
    add_frac();
    return ret;
}


  








  

    .parse(string = '-4712-01-01', comp = true, start = Date::ITALY, limit: 128)  ⇒ Date   



  

    

Note: This method recognizes many forms in string, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times If string does not specify a valid date, the result is unpredictable; consider using ._strptime instead.



Returns a new Date object with values parsed from string:



Date.parse('2001-02-03')   # => #<Date: 2001-02-03>
Date.parse('20010203')     # => #<Date: 2001-02-03>
Date.parse('3rd Feb 2001') # => #<Date: 2001-02-03>



If comp is true and the given year is in the range (0..99), the current century is supplied; otherwise, the year is taken as given:



Date.parse('01-02-03', true)  # => #<Date: 2001-02-03>
Date.parse('01-02-03', false) # => #<Date: 0001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




Related: ._parse (returns a hash).


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 4576



static VALUE
date_s_parse(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, comp, sg, opt;

    rb_scan_args(argc, argv, "03:", &str, &comp, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
	str = rb_str_new2("-4712-01-01");
      case 1:
	comp = Qtrue;
      case 2:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 2;
	VALUE argv2[3], hash;
        argv2[0] = str;
        argv2[1] = comp;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__parse(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    

      .rfc822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128)  ⇒ Date 
      .rfc2822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128)  ⇒ Date 
    

  



  

    

Alias for .rfc822.


  





  








  

    .rfc3339(string = '-4712-01-01T00:00:00+00:00', start = Date::ITALY, limit: 128)  ⇒ Date   



  

    

Returns a new Date object with values parsed from string, which should be a valid RFC 3339 format:



d = Date.new(2001, 2, 3)
s = d.rfc3339   # => "2001-02-03T00:00:00+00:00"
Date.rfc3339(s) # => #<Date: 2001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




Related: ._rfc3339 (returns a hash).


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 4727



static VALUE
date_s_rfc3339(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
	str = rb_str_new2("-4712-01-01T00:00:00+00:00");
      case 1:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__rfc3339(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    .rfc822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128)  ⇒ Date     Also known as: .rfc2822
  



  

    

Returns a new Date object with values parsed from string, which should be a valid RFC 2822 date format:



d = Date.new(2001, 2, 3)
s = d.rfc2822   # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date.rfc2822(s) # => #<Date: 2001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




rfc822 is an alias for .rfc2822.



Related: ._rfc2822 (returns a hash).


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 4871



static VALUE
date_s_rfc2822(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);

    switch (argc) {
      case 0:
	str = rb_str_new2("Mon, 1 Jan -4712 00:00:00 +0000");
      case 1:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__rfc2822(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    .strptime(string = '-4712-01-01', format = '%F', start = Date::ITALY)  ⇒ Date   



  

    

Returns a new Date object with values parsed from string, according to the given format:



Date.strptime('2001-02-03', '%Y-%m-%d')  # => #<Date: 2001-02-03>
Date.strptime('03-02-2001', '%d-%m-%Y')  # => #<Date: 2001-02-03>
Date.strptime('2001-034', '%Y-%j')       # => #<Date: 2001-02-03>
Date.strptime('2001-W05-6', '%G-W%V-%u') # => #<Date: 2001-02-03>
Date.strptime('2001 04 6', '%Y %U %w')   # => #<Date: 2001-02-03>
Date.strptime('2001 05 6', '%Y %W %u')   # => #<Date: 2001-02-03>
Date.strptime('sat3feb01', '%a%d%b%y')   # => #<Date: 2001-02-03>



For other formats, see Formats for Dates and Times. (Unlike #strftime, does not support flags and width.)



See argument start.



See also strptime(3).



Related: ._strptime (returns a hash).


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 4425



static VALUE
date_s_strptime(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, fmt, sg;

    rb_scan_args(argc, argv, "03", &str, &fmt, &sg);

    switch (argc) {
      case 0:
	str = rb_str_new2("-4712-01-01");
      case 1:
	fmt = rb_str_new2("%F");
      case 2:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
	VALUE argv2[2], hash;

	argv2[0] = str;
	argv2[1] = fmt;
	hash = date_s__strptime(2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  








  

    .test_all  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9425



static VALUE
date_s_test_all(VALUE klass)
{
    if (date_s_test_civil(klass) == Qfalse)
	return Qfalse;
    if (date_s_test_ordinal(klass) == Qfalse)
	return Qfalse;
    if (date_s_test_commercial(klass) == Qfalse)
	return Qfalse;
    if (date_s_test_weeknum(klass) == Qfalse)
	return Qfalse;
    if (date_s_test_nth_kday(klass) == Qfalse)
	return Qfalse;
    if (date_s_test_unit_conv(klass) == Qfalse)
	return Qfalse;
    return Qtrue;
}


  








  

    .test_civil  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9161



static VALUE
date_s_test_civil(VALUE klass)
{
    if (!test_civil(MIN_JD, MIN_JD + 366, GREGORIAN))
	return Qfalse;
    if (!test_civil(2305814, 2598007, GREGORIAN))
	return Qfalse;
    if (!test_civil(MAX_JD - 366, MAX_JD, GREGORIAN))
	return Qfalse;

    if (!test_civil(MIN_JD, MIN_JD + 366, ITALY))
	return Qfalse;
    if (!test_civil(2305814, 2598007, ITALY))
	return Qfalse;
    if (!test_civil(MAX_JD - 366, MAX_JD, ITALY))
	return Qfalse;

    return Qtrue;
}


  








  

    .test_commercial  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9245



static VALUE
date_s_test_commercial(VALUE klass)
{
    if (!test_commercial(MIN_JD, MIN_JD + 366, GREGORIAN))
	return Qfalse;
    if (!test_commercial(2305814, 2598007, GREGORIAN))
	return Qfalse;
    if (!test_commercial(MAX_JD - 366, MAX_JD, GREGORIAN))
	return Qfalse;

    if (!test_commercial(MIN_JD, MIN_JD + 366, ITALY))
	return Qfalse;
    if (!test_commercial(2305814, 2598007, ITALY))
	return Qfalse;
    if (!test_commercial(MAX_JD - 366, MAX_JD, ITALY))
	return Qfalse;

    return Qtrue;
}


  








  

    .test_nth_kday  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9333



static VALUE
date_s_test_nth_kday(VALUE klass)
{
    if (!test_nth_kday(MIN_JD, MIN_JD + 366, GREGORIAN))
	return Qfalse;
    if (!test_nth_kday(2305814, 2598007, GREGORIAN))
	return Qfalse;
    if (!test_nth_kday(MAX_JD - 366, MAX_JD, GREGORIAN))
	return Qfalse;

    if (!test_nth_kday(MIN_JD, MIN_JD + 366, ITALY))
	return Qfalse;
    if (!test_nth_kday(2305814, 2598007, ITALY))
	return Qfalse;
    if (!test_nth_kday(MAX_JD - 366, MAX_JD, ITALY))
	return Qfalse;

    return Qtrue;
}


  








  

    .test_ordinal  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9203



static VALUE
date_s_test_ordinal(VALUE klass)
{
    if (!test_ordinal(MIN_JD, MIN_JD + 366, GREGORIAN))
	return Qfalse;
    if (!test_ordinal(2305814, 2598007, GREGORIAN))
	return Qfalse;
    if (!test_ordinal(MAX_JD - 366, MAX_JD, GREGORIAN))
	return Qfalse;

    if (!test_ordinal(MIN_JD, MIN_JD + 366, ITALY))
	return Qfalse;
    if (!test_ordinal(2305814, 2598007, ITALY))
	return Qfalse;
    if (!test_ordinal(MAX_JD - 366, MAX_JD, ITALY))
	return Qfalse;

    return Qtrue;
}


  








  

    .test_unit_conv  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9410



static VALUE
date_s_test_unit_conv(VALUE klass)
{
    if (!test_unit_v2v_iter(sec_to_day, day_to_sec))
	return Qfalse;
    if (!test_unit_v2v_iter(ms_to_sec, sec_to_ms))
	return Qfalse;
    if (!test_unit_v2v_iter(ns_to_day, day_to_ns))
	return Qfalse;
    if (!test_unit_v2v_iter(ns_to_sec, sec_to_ns))
	return Qfalse;
    return Qtrue;
}


  








  

    .test_weeknum  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9287



static VALUE
date_s_test_weeknum(VALUE klass)
{
    int f;

    for (f = 0; f <= 1; f++) {
	if (!test_weeknum(MIN_JD, MIN_JD + 366, f, GREGORIAN))
	    return Qfalse;
	if (!test_weeknum(2305814, 2598007, f, GREGORIAN))
	    return Qfalse;
	if (!test_weeknum(MAX_JD - 366, MAX_JD, f, GREGORIAN))
	    return Qfalse;

	if (!test_weeknum(MIN_JD, MIN_JD + 366, f, ITALY))
	    return Qfalse;
	if (!test_weeknum(2305814, 2598007, f, ITALY))
	    return Qfalse;
	if (!test_weeknum(MAX_JD - 366, MAX_JD, f, ITALY))
	    return Qfalse;
    }

    return Qtrue;
}


  








  

    .today(start = Date::ITALY)  ⇒ Date   



  

    

Returns a new Date object constructed from the present date:



Date.today.to_s # => "2022-07-06"



See argument start.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 3790



static VALUE
date_s_today(int argc, VALUE *argv, VALUE klass)
{
    VALUE vsg, nth, ret;
    double sg;
    time_t t;
    struct tm tm;
    int y, ry, m, d;

    rb_scan_args(argc, argv, "01", &vsg);

    if (argc < 1)
	sg = DEFAULT_SG;
    else
	val2sg(vsg, sg);

    if (time(&t) == -1)
	rb_sys_fail("time");
    tzset();
    if (!localtime_r(&t, &tm))
	rb_sys_fail("localtime");

    y = tm.tm_year + 1900;
    m = tm.tm_mon + 1;
    d = tm.tm_mday;

    decode_year(INT2FIX(y), -1, &nth, &ry);

    ret = d_simple_new_internal(klass,
				nth, 0,
				GREGORIAN,
				ry, m, d,
				HAVE_CIVIL);
    {
	get_d1(ret);
	set_sg(dat, sg);
    }
    return ret;
}


  








  

    

      .valid_date?(year, month, mday, start = Date::ITALY)  ⇒ Boolean 
      .valid_civil?(year, month, mday, start = Date::ITALY)  ⇒ Boolean 
    

  



  

    

Alias for .valid_date?.


  





  








  

    .valid_commercial?(cwyear, cweek, cwday, start = Date::ITALY)  ⇒ Boolean   



  

    

Returns true if the arguments define a valid commercial date, false otherwise:



Date.valid_commercial?(2001, 5, 6) # => true
Date.valid_commercial?(2001, 5, 8) # => false



See .commercial.



See argument start.



Related: .jd, .commercial.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 2774



static VALUE
date_s_valid_commercial_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vw, vd, vsg;
    VALUE argv2[4];

    rb_scan_args(argc, argv, "31", &vy, &vw, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vw);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vw;
    argv2[2] = vd;
    if (argc < 4)
	argv2[3] = INT2FIX(DEFAULT_SG);
    else
	argv2[3] = vsg;

    if (NIL_P(valid_commercial_sub(4, argv2, klass, 0)))
	return Qfalse;
    return Qtrue;
}


  








  

    .valid_date?(year, month, mday, start = Date::ITALY)  ⇒ Boolean     Also known as: .valid_civil?
  



  

    

Returns true if the arguments define a valid ordinal date, false otherwise:



Date.valid_date?(2001, 2, 3)  # => true
Date.valid_date?(2001, 2, 29) # => false
Date.valid_date?(2001, 2, -1) # => true



See argument start.



valid_date? is an alias for .valid_civil?.



Related: .jd, .new.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 2596



static VALUE
date_s_valid_civil_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vm, vd, vsg;
    VALUE argv2[4];

    rb_scan_args(argc, argv, "31", &vy, &vm, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vm);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vm;
    argv2[2] = vd;
    if (argc < 4)
	argv2[3] = INT2FIX(DEFAULT_SG);
    else
	argv2[3] = vsg;

    if (NIL_P(valid_civil_sub(4, argv2, klass, 0)))
	return Qfalse;
    return Qtrue;
}


  








  

    .valid_jd?(jd, start = Date::ITALY)  ⇒ true   



  

    

Implemented for compatibility; returns true unless .jd is invalid (i.e., not a Numeric).



Date.valid_jd?(2451944) # => true



See argument start.



Related: .jd.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 2500



static VALUE
date_s_valid_jd_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vjd, vsg;
    VALUE argv2[2];

    rb_scan_args(argc, argv, "11", &vjd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vjd);
    argv2[0] = vjd;
    if (argc < 2)
	argv2[1] = INT2FIX(DEFAULT_SG);
    else
	argv2[1] = vsg;

    if (NIL_P(valid_jd_sub(2, argv2, klass, 0)))
	return Qfalse;
    return Qtrue;
}


  








  

    .valid_ordinal?(year, yday, start = Date::ITALY)  ⇒ Boolean   



  

    

Returns true if the arguments define a valid ordinal date, false otherwise:



Date.valid_ordinal?(2001, 34)  # => true
Date.valid_ordinal?(2001, 366) # => false



See argument start.



Related: .jd, .ordinal.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 2684



static VALUE
date_s_valid_ordinal_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vd, vsg;
    VALUE argv2[3];

    rb_scan_args(argc, argv, "21", &vy, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vd;
    if (argc < 3)
	argv2[2] = INT2FIX(DEFAULT_SG);
    else
	argv2[2] = vsg;

    if (NIL_P(valid_ordinal_sub(3, argv2, klass, 0)))
	return Qfalse;
    return Qtrue;
}


  








  

    .weeknum(*args)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 3657



static VALUE
date_s_weeknum(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vw, vd, vf, vsg, y, fr, fr2, ret;
    int w, d, f;
    double sg;

    rb_scan_args(argc, argv, "05", &vy, &vw, &vd, &vf, &vsg);

    y = INT2FIX(-4712);
    w = 0;
    d = 1;
    f = 0;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 5:
	val2sg(vsg, sg);
      case 4:
	f = NUM2INT(vf);
      case 3:
	num2int_with_frac(d, positive_inf);
      case 2:
	w = NUM2INT(vw);
      case 1:
	y = vy;
    }

    {
	VALUE nth;
	int ry, rw, rd, rjd, ns;

	if (!valid_weeknum_p(y, w, d, f, sg,
			     &nth, &ry,
			     &rw, &rd, &rjd,
			     &ns))
	    rb_raise(eDateError, "invalid date");

	ret = d_simple_new_internal(klass,
				    nth, rjd,
				    sg,
				    0, 0, 0,
				    HAVE_JD);
    }
    add_frac();
    return ret;
}


  








  

    .xmlschema(string = '-4712-01-01', start = Date::ITALY, limit: 128)  ⇒ Date   



  

    

Returns a new Date object with values parsed from string, which should be a valid XML date format:



d = Date.new(2001, 2, 3)
s = d.xmlschema   # => "2001-02-03"
Date.xmlschema(s) # => #<Date: 2001-02-03>



See:


  • 

    Argument start.
    

  • 

    Argument limit.
    




Related: ._xmlschema (returns a hash).


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 4796



static VALUE
date_s_xmlschema(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
	str = rb_str_new2("-4712-01-01");
      case 1:
	sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
	hash = date_s__xmlschema(argc2, argv2, klass);
	return d_new_by_frags(klass, hash, sg);
    }
}


  







Instance Attribute Details



  

    #friday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Friday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5551



static VALUE
d_lite_friday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 5);
}


  








  

    #gregorian  ⇒ Date  (readonly)  



  

    

Equivalent to #new_start with argument GREGORIAN.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5906



static VALUE
d_lite_gregorian(VALUE self)
{
    return dup_obj_with_new_start(self, GREGORIAN);
}


  








  

    #gregorian?  ⇒ Boolean  (readonly)  



  

    

Returns true if the date is on or after the date of calendar reform, false otherwise:



Date.new(1582, 10, 15).gregorian?       # => true
(Date.new(1582, 10, 15) - 1).gregorian? # => false


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5719



static VALUE
d_lite_gregorian_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_gregorian_p(dat));
}


  








  

    #infinite?  ⇒ Boolean  (readonly)  



  

    

Returns false


  



  [ GitHub ]


  

  


# File 'ext/date/lib/date.rb', line 13



def infinite?
  false
end


  








  

    #julian  ⇒ Date  (readonly)  



  

    

Equivalent to #new_start with argument JULIAN.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5894



static VALUE
d_lite_julian(VALUE self)
{
    return dup_obj_with_new_start(self, JULIAN);
}


  








  

    #julian?  ⇒ Boolean  (readonly)  



  

    

Returns true if the date is before the date of calendar reform, false otherwise:



(Date.new(1582, 10, 15) - 1).julian? # => true
Date.new(1582, 10, 15).julian?       # => false


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5701



static VALUE
d_lite_julian_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_julian_p(dat));
}


  








  

    #leap?  ⇒ Boolean  (readonly)  



  

    

Returns true if the year is a leap year, false otherwise:



Date.new(2000).leap? # => true
Date.new(2001).leap? # => false


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5736



static VALUE
d_lite_leap_p(VALUE self)
{
    int rjd, ns, ry, rm, rd;

    get_d1(self);
    if (m_gregorian_p(dat))
	return f_boolcast(c_gregorian_leap_p(m_year(dat)));

    c_civil_to_jd(m_year(dat), 3, 1, m_virtual_sg(dat),
		  &rjd, &ns);
    c_jd_to_civil(rjd - 1, m_virtual_sg(dat), &ry, &rm, &rd);
    return f_boolcast(rd == 29);
}


  








  

    #monday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Monday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5499



static VALUE
d_lite_monday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 1);
}


  








  

    #saturday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Saturday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5564



static VALUE
d_lite_saturday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 6);
}


  








  

    #sunday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Sunday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5486



static VALUE
d_lite_sunday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 0);
}


  








  

    #thursday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Thursday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5538



static VALUE
d_lite_thursday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 4);
}


  








  

    #tuesday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Tuesday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5512



static VALUE
d_lite_tuesday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 2);
}


  








  

    #wednesday?  ⇒ Boolean  (readonly)  



  

    

Returns true if self is a Wednesday, false otherwise.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5525



static VALUE
d_lite_wednesday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 3);
}


  







Instance Method Details



  

    #+(other)  ⇒ Date   



  

    

Returns a date object pointing other days after self.  The other should be a numeric value.  If the other is a fractional number, assumes its precision is at most nanosecond.



Date.new(2001,2,3) + 1    #=> #<Date: 2001-02-04 ...>
DateTime.new(2001,2,3) + Rational(1,2)
                          #=> #<DateTime: 2001-02-03T12:00:00+00:00 ...>
DateTime.new(2001,2,3) + Rational(-1,2)
                          #=> #<DateTime: 2001-02-02T12:00:00+00:00 ...>
DateTime.jd(0,12) + DateTime.new(2001,2,3).ajd
                          #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...>


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5974



static VALUE
d_lite_plus(VALUE self, VALUE other)
{
    int try_rational = 1;
    get_d1(self);

  again:
    switch (TYPE(other)) {
      case T_FIXNUM:
	{
	    VALUE nth;
	    long t;
	    int jd;

	    nth = m_nth(dat);
	    t = FIX2LONG(other);
	    if (DIV(t, CM_PERIOD)) {
		nth = f_add(nth, INT2FIX(DIV(t, CM_PERIOD)));
		t = MOD(t, CM_PERIOD);
	    }

	    if (!t)
		jd = m_jd(dat);
	    else {
		jd = m_jd(dat) + (int)t;
		canonicalize_jd(nth, jd);
	    }

	    if (simple_dat_p(dat))
		return d_simple_new_internal(rb_obj_class(self),
					     nth, jd,
					     dat->s.sg,
					     0, 0, 0,
					     (dat->s.flags | HAVE_JD) &
					     ~HAVE_CIVIL);
	    else
		return d_complex_new_internal(rb_obj_class(self),
					      nth, jd,
					      dat->c.df, dat->c.sf,
					      dat->c.of, dat->c.sg,
					      0, 0, 0,
#ifndef USE_PACK
					      dat->c.hour,
					      dat->c.min,
					      dat->c.sec,
#else
					      EX_HOUR(dat->c.pc),
					      EX_MIN(dat->c.pc),
					      EX_SEC(dat->c.pc),
#endif
					      (dat->c.flags | HAVE_JD) &
					      ~HAVE_CIVIL);
	}
	break;
      case T_BIGNUM:
	{
	    VALUE nth;
	    int jd, s;

	    if (f_positive_p(other))
		s = +1;
	    else {
		s = -1;
		other = f_negate(other);
	    }

	    nth = f_idiv(other, INT2FIX(CM_PERIOD));
	    jd = FIX2INT(f_mod(other, INT2FIX(CM_PERIOD)));

	    if (s < 0) {
		nth = f_negate(nth);
		jd = -jd;
	    }

	    if (!jd)
		jd = m_jd(dat);
	    else {
		jd = m_jd(dat) + jd;
		canonicalize_jd(nth, jd);
	    }

	    if (f_zero_p(nth))
		nth = m_nth(dat);
	    else
		nth = f_add(m_nth(dat), nth);

	    if (simple_dat_p(dat))
		return d_simple_new_internal(rb_obj_class(self),
					     nth, jd,
					     dat->s.sg,
					     0, 0, 0,
					     (dat->s.flags | HAVE_JD) &
					     ~HAVE_CIVIL);
	    else
		return d_complex_new_internal(rb_obj_class(self),
					      nth, jd,
					      dat->c.df, dat->c.sf,
					      dat->c.of, dat->c.sg,
					      0, 0, 0,
#ifndef USE_PACK
					      dat->c.hour,
					      dat->c.min,
					      dat->c.sec,
#else
					      EX_HOUR(dat->c.pc),
					      EX_MIN(dat->c.pc),
					      EX_SEC(dat->c.pc),
#endif
					      (dat->c.flags | HAVE_JD) &
					      ~HAVE_CIVIL);
	}
	break;
      case T_FLOAT:
	{
	    double jd, o, tmp;
	    int s, df;
	    VALUE nth, sf;

	    o = RFLOAT_VALUE(other);

	    if (o > 0)
		s = +1;
	    else {
		s = -1;
		o = -o;
	    }

	    o = modf(o, &tmp);

	    if (!floor(tmp / CM_PERIOD)) {
		nth = INT2FIX(0);
		jd = (int)tmp;
	    }
	    else {
		double i, f;

		f = modf(tmp / CM_PERIOD, &i);
		nth = f_floor(DBL2NUM(i));
		jd = (int)(f * CM_PERIOD);
	    }

	    o *= DAY_IN_SECONDS;
	    o = modf(o, &tmp);
	    df = (int)tmp;
	    o *= SECOND_IN_NANOSECONDS;
	    sf = INT2FIX((int)round(o));

	    if (s < 0) {
		jd = -jd;
		df = -df;
		sf = f_negate(sf);
	    }

	    if (f_zero_p(sf))
		sf = m_sf(dat);
	    else {
		sf = f_add(m_sf(dat), sf);
		if (f_lt_p(sf, INT2FIX(0))) {
		    df -= 1;
		    sf = f_add(sf, INT2FIX(SECOND_IN_NANOSECONDS));
		}
		else if (f_ge_p(sf, INT2FIX(SECOND_IN_NANOSECONDS))) {
		    df += 1;
		    sf = f_sub(sf, INT2FIX(SECOND_IN_NANOSECONDS));
		}
	    }

	    if (!df)
		df = m_df(dat);
	    else {
		df = m_df(dat) + df;
		if (df < 0) {
		    jd -= 1;
		    df += DAY_IN_SECONDS;
		}
		else if (df >= DAY_IN_SECONDS) {
		    jd += 1;
		    df -= DAY_IN_SECONDS;
		}
	    }

	    if (!jd)
		jd = m_jd(dat);
	    else {
		jd = m_jd(dat) + jd;
		canonicalize_jd(nth, jd);
	    }

	    if (f_zero_p(nth))
		nth = m_nth(dat);
	    else
		nth = f_add(m_nth(dat), nth);

	    if (!df && f_zero_p(sf) && !m_of(dat))
		return d_simple_new_internal(rb_obj_class(self),
					     nth, (int)jd,
					     m_sg(dat),
					     0, 0, 0,
					     (dat->s.flags | HAVE_JD) &
					     ~(HAVE_CIVIL | HAVE_TIME |
					       COMPLEX_DAT));
	    else
		return d_complex_new_internal(rb_obj_class(self),
					      nth, (int)jd,
					      df, sf,
					      m_of(dat), m_sg(dat),
					      0, 0, 0,
					      0, 0, 0,
					      (dat->c.flags |
					       HAVE_JD | HAVE_DF) &
					      ~(HAVE_CIVIL | HAVE_TIME));
	}
	break;
      default:
	expect_numeric(other);
	other = f_to_r(other);
	if (!k_rational_p(other)) {
	    if (!try_rational) Check_Type(other, T_RATIONAL);
	    try_rational = 0;
	    goto again;
	}
	/* fall through */
      case T_RATIONAL:
	{
	    VALUE nth, sf, t;
	    int jd, df, s;

	    if (wholenum_p(other)) {
		other = rb_rational_num(other);
		goto again;
	    }

	    if (f_positive_p(other))
		s = +1;
	    else {
		s = -1;
		other = f_negate(other);
	    }

	    nth = f_idiv(other, INT2FIX(CM_PERIOD));
	    t = f_mod(other, INT2FIX(CM_PERIOD));

	    jd = FIX2INT(f_idiv(t, INT2FIX(1)));
	    t = f_mod(t, INT2FIX(1));

	    t = f_mul(t, INT2FIX(DAY_IN_SECONDS));
	    df = FIX2INT(f_idiv(t, INT2FIX(1)));
	    t = f_mod(t, INT2FIX(1));

	    sf = f_mul(t, INT2FIX(SECOND_IN_NANOSECONDS));

	    if (s < 0) {
		nth = f_negate(nth);
		jd = -jd;
		df = -df;
		sf = f_negate(sf);
	    }

	    if (f_zero_p(sf))
		sf = m_sf(dat);
	    else {
		sf = f_add(m_sf(dat), sf);
		if (f_lt_p(sf, INT2FIX(0))) {
		    df -= 1;
		    sf = f_add(sf, INT2FIX(SECOND_IN_NANOSECONDS));
		}
		else if (f_ge_p(sf, INT2FIX(SECOND_IN_NANOSECONDS))) {
		    df += 1;
		    sf = f_sub(sf, INT2FIX(SECOND_IN_NANOSECONDS));
		}
	    }

	    if (!df)
		df = m_df(dat);
	    else {
		df = m_df(dat) + df;
		if (df < 0) {
		    jd -= 1;
		    df += DAY_IN_SECONDS;
		}
		else if (df >= DAY_IN_SECONDS) {
		    jd += 1;
		    df -= DAY_IN_SECONDS;
		}
	    }

	    if (!jd)
		jd = m_jd(dat);
	    else {
		jd = m_jd(dat) + jd;
		canonicalize_jd(nth, jd);
	    }

	    if (f_zero_p(nth))
		nth = m_nth(dat);
	    else
		nth = f_add(m_nth(dat), nth);

	    if (!df && f_zero_p(sf) && !m_of(dat))
		return d_simple_new_internal(rb_obj_class(self),
					     nth, jd,
					     m_sg(dat),
					     0, 0, 0,
					     (dat->s.flags | HAVE_JD) &
					     ~(HAVE_CIVIL | HAVE_TIME |
					       COMPLEX_DAT));
	    else
		return d_complex_new_internal(rb_obj_class(self),
					      nth, jd,
					      df, sf,
					      m_of(dat), m_sg(dat),
					      0, 0, 0,
					      0, 0, 0,
					      (dat->c.flags |
					       HAVE_JD | HAVE_DF) &
					      ~(HAVE_CIVIL | HAVE_TIME));
	}
	break;
    }
}


  








  

    #-(other)  ⇒ Date, Rational   



  

    

Returns the difference between the two dates if the other is a date object.  If the other is a numeric value, returns a date object pointing other days before self.  If the other is a fractional number, assumes its precision is at most nanosecond.



Date.new(2001,2,3) - 1   #=> #<Date: 2001-02-02 ...>
DateTime.new(2001,2,3) - Rational(1,2)
                         #=> #<DateTime: 2001-02-02T12:00:00+00:00 ...>
Date.new(2001,2,3) - Date.new(2001)
                         #=> (33/1)
DateTime.new(2001,2,3) - DateTime.new(2001,2,2,12)
                         #=> (1/2)


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6363



static VALUE
d_lite_minus(VALUE self, VALUE other)
{
    if (k_date_p(other))
	return minus_dd(self, other);

    switch (TYPE(other)) {
      case T_FIXNUM:
	return d_lite_plus(self, LONG2NUM(-FIX2LONG(other)));
      case T_FLOAT:
	return d_lite_plus(self, DBL2NUM(-RFLOAT_VALUE(other)));
      default:
	expect_numeric(other);
	/* fall through */
      case T_BIGNUM:
      case T_RATIONAL:
	return d_lite_plus(self, f_negate(other));
    }
}


  








  

    #<<(n)  ⇒ Date   



  

    

Returns a new Date object representing the date n months earlier; n should be a numeric:



(Date.new(2001, 2, 3) << 1).to_s  # => "2001-01-03"
(Date.new(2001, 2, 3) << -2).to_s # => "2001-04-03"



When the same day does not exist for the new month, the last day of that month is used instead:



(Date.new(2001, 3, 31) << 1).to_s  # => "2001-02-28"
(Date.new(2001, 3, 31) << -6).to_s # => "2001-09-30"



This results in the following, possibly unexpected, behaviors:



d0 = Date.new(2001, 3, 31)
d0 << 2      # => #<Date: 2001-01-31>
d0 << 1 << 1 # => #<Date: 2001-01-28>

d0 = Date.new(2001, 3, 31)
d1 = d0 << 1  # => #<Date: 2001-02-28>
d2 = d1 << -1 # => #<Date: 2001-03-28>


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6528



static VALUE
d_lite_lshift(VALUE self, VALUE other)
{
    expect_numeric(other);
    return d_lite_rshift(self, f_negate(other));
}


  








  

    #<=>(other)  ⇒ 1, ...   



  

    

Compares self and other, returning:


  • 

    -1 if other is larger.
    

  • 

    0 if the two are equal.
    

  • 

    1 if other is smaller.
    

  • 

    nil if the two are incomparable.
    




Argument other may be:


  • 

    Another Date object:
    


    d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)>
prev_date = d.prev_day    # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)>
next_date = d.next_day    # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)>
d <=> next_date           # => -1
d <=> d                   # => 0
d <=> prev_date           # => 1
    

  • 

    A DateTime object:
    


    d <=> DateTime.new(2022, 7, 26) # => 1
d <=> DateTime.new(2022, 7, 27) # => 0
d <=> DateTime.new(2022, 7, 28) # => -1
    

  • 

    A numeric (compares self.ajd to other):
    


    d <=> 2459788 # => -1
d <=> 2459787 # => 1
d <=> 2459786 # => 1
d <=> d.ajd   # => 0
    

  • 

    Any other object:
    


    d <=> Object.new # => nil
    



  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6825



static VALUE
d_lite_cmp(VALUE self, VALUE other)
{
    if (!k_date_p(other))
	return cmp_gen(self, other);

    {
	get_d2(self, other);

	if (!(simple_dat_p(adat) && simple_dat_p(bdat) &&
	      m_gregorian_p(adat) == m_gregorian_p(bdat)))
	    return cmp_dd(self, other);

	{
	    VALUE a_nth, b_nth;
	    int a_jd, b_jd;

	    m_canonicalize_jd(self, adat);
	    m_canonicalize_jd(other, bdat);
	    a_nth = m_nth(adat);
	    b_nth = m_nth(bdat);
	    if (f_eqeq_p(a_nth, b_nth)) {
		a_jd = m_jd(adat);
		b_jd = m_jd(bdat);
		if (a_jd == b_jd) {
		    return INT2FIX(0);
		}
		else if (a_jd < b_jd) {
		    return INT2FIX(-1);
		}
		else {
		    return INT2FIX(1);
		}
	    }
	    else if (f_lt_p(a_nth, b_nth)) {
		return INT2FIX(-1);
	    }
	    else {
		return INT2FIX(1);
	    }
	}
    }
}


  








  

    #===(other)  ⇒ true, ...   



  

    

Returns true if self and other represent the same date, false if not, nil if the two are not comparable.



Argument other may be:


  • 

    Another Date object:
    


    d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)>
prev_date = d.prev_day    # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)>
next_date = d.next_day    # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)>
d === prev_date           # => false
d === d                   # => true
d === next_date           # => false
    

  • 

    A DateTime object:
    


    d === DateTime.new(2022, 7, 26) # => false
d === DateTime.new(2022, 7, 27) # => true
d === DateTime.new(2022, 7, 28) # => false
    

  • 

    A numeric (compares self.jd to other):
    


    d === 2459788 # => true
d === 2459787 # => false
d === 2459786 # => false
d === d.jd    # => true
    

  • 

    An object not comparable:
    


    d === Object.new # => nil
    



  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6917



static VALUE
d_lite_equal(VALUE self, VALUE other)
{
    if (!k_date_p(other))
	return equal_gen(self, other);

    {
	get_d2(self, other);

	if (!(m_gregorian_p(adat) == m_gregorian_p(bdat)))
	    return equal_gen(self, other);

	{
	    VALUE a_nth, b_nth;
	    int a_jd, b_jd;

	    m_canonicalize_jd(self, adat);
	    m_canonicalize_jd(other, bdat);
	    a_nth = m_nth(adat);
	    b_nth = m_nth(bdat);
	    a_jd = m_local_jd(adat);
	    b_jd = m_local_jd(bdat);
	    if (f_eqeq_p(a_nth, b_nth) &&
		a_jd == b_jd)
		return Qtrue;
	    return Qfalse;
	}
    }
}


  








  

    #>>(n)  ⇒ Date   



  

    

Returns a new Date object representing the date n months later; n should be a numeric:



(Date.new(2001, 2, 3) >> 1).to_s  # => "2001-03-03"
(Date.new(2001, 2, 3) >> -2).to_s # => "2000-12-03"



When the same day does not exist for the new month, the last day of that month is used instead:



(Date.new(2001, 1, 31) >> 1).to_s  # => "2001-02-28"
(Date.new(2001, 1, 31) >> -4).to_s # => "2000-09-30"



This results in the following, possibly unexpected, behaviors:



d0 = Date.new(2001, 1, 31)
d1 = d0 >> 1 # => #<Date: 2001-02-28>
d2 = d1 >> 1 # => #<Date: 2001-03-28>

d0 = Date.new(2001, 1, 31)
d1 = d0 >> 1  # => #<Date: 2001-02-28>
d2 = d1 >> -1 # => #<Date: 2001-01-28>


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6462



static VALUE
d_lite_rshift(VALUE self, VALUE other)
{
    VALUE t, y, nth, rjd2;
    int m, d, rjd;
    double sg;

    get_d1(self);
    t = f_add3(f_mul(m_real_year(dat), INT2FIX(12)),
	       INT2FIX(m_mon(dat) - 1),
	       other);
    if (FIXNUM_P(t)) {
	long it = FIX2LONG(t);
	y = LONG2NUM(DIV(it, 12));
	it = MOD(it, 12);
	m = (int)it + 1;
    }
    else {
	y = f_idiv(t, INT2FIX(12));
	t = f_mod(t, INT2FIX(12));
	m = FIX2INT(t) + 1;
    }
    d = m_mday(dat);
    sg = m_sg(dat);

    while (1) {
	int ry, rm, rd, ns;

	if (valid_civil_p(y, m, d, sg,
			  &nth, &ry,
			  &rm, &rd, &rjd, &ns))
	    break;
	if (--d < 1)
	    rb_raise(eDateError, "invalid date");
    }
    encode_jd(nth, rjd, &rjd2);
    return d_lite_plus(self, f_sub(rjd2, m_real_local_jd(dat)));
}


  








  

    #ajd  ⇒ Rational   



  

    

Returns the astronomical Julian day number.  This is a fractional number, which is not adjusted by the offset.



DateTime.new(2001,2,3,4,5,6,'+7').ajd     #=> (11769328217/4800)
DateTime.new(2001,2,2,14,5,6,'-7').ajd    #=> (11769328217/4800)


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5231



static VALUE
d_lite_ajd(VALUE self)
{
    get_d1(self);
    return m_ajd(dat);
}


  








  

    #amjd  ⇒ Rational   



  

    

Returns the astronomical modified Julian day number.  This is a fractional number, which is not adjusted by the offset.



DateTime.new(2001,2,3,4,5,6,'+7').amjd    #=> (249325817/4800)
DateTime.new(2001,2,2,14,5,6,'-7').amjd   #=> (249325817/4800)


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5248



static VALUE
d_lite_amjd(VALUE self)
{
    get_d1(self);
    return m_amjd(dat);
}


  








  

    

      #ctime  ⇒ String 
      #asctime  ⇒ String 
    

  



  

    

Alias for #ctime.


  





  








  

    #ctime  ⇒ String     Also known as: #asctime
  



  

    

Equivalent to #strftime with argument '%a %b %e %T %Y' (or its shorthand form '%c'):



Date.new(2001, 2, 3).asctime # => "Sat Feb  3 00:00:00 2001"



See asctime.



ctime is an alias for #asctime.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7303



static VALUE
d_lite_asctime(VALUE self)
{
    return strftimev("%a %b %e %H:%M:%S %Y", self, set_tmx);
}


  








  

    #cwday  ⇒ Integer   



  

    

Returns the commercial-date weekday index for self (see .commercial); 1 is Monday:



Date.new(2001, 2, 3).cwday # => 6


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5439



static VALUE
d_lite_cwday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_cwday(dat));
}


  








  

    #cweek  ⇒ Integer   



  

    

Returns commercial-date week index for self (see .commercial):



Date.new(2001, 2, 3).cweek # => 5


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5421



static VALUE
d_lite_cweek(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_cweek(dat));
}


  








  

    #cwyear  ⇒ Integer   



  

    

Returns commercial-date year for self (see .commercial):



Date.new(2001, 2, 3).cwyear # => 2001
Date.new(2000, 1, 1).cwyear # => 1999


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5404



static VALUE
d_lite_cwyear(VALUE self)
{
    get_d1(self);
    return m_real_cwyear(dat);
}


  








  

    #day  ⇒ Integer     Also known as: #mday
  



  

    

Returns the day of the month in range (1..31):



Date.new(2001, 2, 3).mday # => 3



day is an alias for #mday.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5368



static VALUE
d_lite_mday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_mday(dat));
}


  








  

    #day_fraction  ⇒ Rational   



  

    

Returns the fractional part of the day in range (Rational(0, 1)…Rational(1, 1)):



DateTime.new(2001,2,3,12).day_fraction # => (1/2)


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5384



static VALUE
d_lite_day_fraction(VALUE self)
{
    get_d1(self);
    if (simple_dat_p(dat))
	return INT2FIX(0);
    return m_fr(dat);
}


  








  

    #deconstruct_keys(array_of_names_or_nil)  ⇒ Hash   



  

    

Returns a hash of the name/value pairs, to use in pattern matching. Possible keys are: :year, :month, :day, :wday, :yday.



Possible usages:



d = Date.new(2022, 10, 5)

if d in wday: 3, day: ..7  # uses deconstruct_keys underneath
  puts "first Wednesday of the month"
end
#=> prints "first Wednesday of the month"

case d
in year: ...2022
  puts "too old"
in month: ..9
  puts "quarter 1-3"
in wday: 1..5, month:
  puts "working day in month #{month}"
end
#=> prints "working day in month 10"



Note that deconstruction by pattern can also be combined with class check:



if d in Date(wday: 3, day: ..7)
  puts "first Wednesday of the month"
end


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7524



static VALUE
d_lite_deconstruct_keys(VALUE self, VALUE keys)
{
    return deconstruct_keys(self, keys, /* is_datetime=false */ 0);
}


  








  

    #downto(min) {|date| ... } ⇒ self   



  

    

Equivalent to #step with arguments #min and -1.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6701



static VALUE
d_lite_downto(VALUE self, VALUE min)
{
    VALUE date;

    RETURN_ENUMERATOR(self, 1, &min);

    date = self;
    while (FIX2INT(d_lite_cmp(date, min)) >= 0) {
	rb_yield(date);
	date = d_lite_plus(date, INT2FIX(-1));
    }
    return self;
}


  








  

    #england  ⇒ Date   



  

    

Equivalent to #new_start with argument ENGLAND.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5882



static VALUE
d_lite_england(VALUE self)
{
    return dup_obj_with_new_start(self, ENGLAND);
}


  








  

    #eql?(other)  ⇒ Boolean 
  

  

    This method is for internal use only.
  



  

    
  





  


  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6948



static VALUE
d_lite_eql_p(VALUE self, VALUE other)
{
    if (!k_date_p(other))
	return Qfalse;
    return f_zero_p(d_lite_cmp(self, other));
}


  








  

    #fill  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5202



static VALUE
d_lite_fill(VALUE self)
{
    get_d1(self);

    if (simple_dat_p(dat)) {
	get_s_jd(dat);
	get_s_civil(dat);
    }
    else {
	get_c_jd(dat);
	get_c_civil(dat);
	get_c_df(dat);
	get_c_time(dat);
    }
    return self;
}


  








  

    #hash  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6957



static VALUE
d_lite_hash(VALUE self)
{
    st_index_t v, h[4];

    get_d1(self);
    h[0] = m_nth(dat);
    h[1] = m_jd(dat);
    h[2] = m_df(dat);
    h[3] = m_sf(dat);
    v = rb_memhash(h, sizeof(h));
    return ST2FIX(v);
}


  








  

    #hour   (private)
  

  

    This method is for internal use only.
  



  

    

Alias for #min.


  









  

    #httpdate  ⇒ String   



  

    

Equivalent to #strftime with argument '%a, %d %b %Y %T GMT'; see Formats for Dates and Times:



Date.new(2001, 2, 3).httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7370



static VALUE
d_lite_httpdate(VALUE self)
{
    volatile VALUE dup = dup_obj_with_new_offset(self, 0);
    return strftimev("%a, %d %b %Y %T GMT", dup, set_tmx);
}


  








  

    #initialize_copy(date)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5156



static VALUE
d_lite_initialize_copy(VALUE copy, VALUE date)
{
    rb_check_frozen(copy);

    if (copy == date)
	return copy;
    {
	get_d2(copy, date);
	if (simple_dat_p(bdat)) {
	    if (simple_dat_p(adat)) {
		adat->s = bdat->s;
	    }
	    else {
		adat->c.flags = bdat->s.flags | COMPLEX_DAT;
		adat->c.nth = bdat->s.nth;
		adat->c.jd = bdat->s.jd;
		adat->c.df = 0;
		adat->c.sf = INT2FIX(0);
		adat->c.of = 0;
		adat->c.sg = bdat->s.sg;
		adat->c.year = bdat->s.year;
#ifndef USE_PACK
		adat->c.mon = bdat->s.mon;
		adat->c.mday = bdat->s.mday;
		adat->c.hour = bdat->s.hour;
		adat->c.min = bdat->s.min;
		adat->c.sec = bdat->s.sec;
#else
		adat->c.pc = bdat->s.pc;
#endif
	    }
	}
	else {
	    if (!complex_dat_p(adat))
		rb_raise(rb_eArgError,
			 "cannot load complex into simple");

	    adat->c = bdat->c;
	}
    }
    return copy;
}


  








  

    #inspect  ⇒ String   



  

    

Returns a string representation of self:



Date.new(2001, 2, 3).inspect
# => "#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>"


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7074



static VALUE
d_lite_inspect(VALUE self)
{
    get_d1(self);
    return mk_inspect(dat, rb_obj_class(self), self);
}


  








  

    #inspect_raw  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7045



static VALUE
d_lite_inspect_raw(VALUE self)
{
    get_d1(self);
    return mk_inspect_raw(dat, rb_obj_class(self));
}


  








  

    #iso8601  ⇒ String     Also known as: #xmlschema
  



  

    

Equivalent to #strftime with argument '%Y-%m-%d' (or its shorthand form '%F');



Date.new(2001, 2, 3).iso8601 # => "2001-02-03"



#xmlschema is an alias for iso8601.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7321



static VALUE
d_lite_iso8601(VALUE self)
{
    return strftimev("%Y-%m-%d", self, set_tmx);
}


  








  

    #italy  ⇒ Date   



  

    

Equivalent to #new_start with argument ITALY.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5870



static VALUE
d_lite_italy(VALUE self)
{
    return dup_obj_with_new_start(self, ITALY);
}


  








  

    #jd  ⇒ Integer   



  

    

Returns the Julian day number.  This is a whole number, which is adjusted by the offset as the local time.



DateTime.new(2001,2,3,4,5,6,'+7').jd      #=> 2451944
DateTime.new(2001,2,3,4,5,6,'-7').jd      #=> 2451944


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5265



static VALUE
d_lite_jd(VALUE self)
{
    get_d1(self);
    return m_real_local_jd(dat);
}


  








  

    #jisx0301  ⇒ String   



  

    

Returns a string representation of the date in self in JIS X 0301 format.



Date.new(2001, 2, 3).jisx0301 # => "H13.02.03"


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7427



static VALUE
d_lite_jisx0301(VALUE self)
{
    char fmtbuf[JISX0301_DATE_SIZE];
    const char *fmt;

    get_d1(self);
    fmt = jisx0301_date_format(fmtbuf, sizeof(fmtbuf),
			       m_real_local_jd(dat),
			       m_real_year(dat));
    return strftimev(fmt, self, set_tmx);
}


  








  

    #ld  ⇒ Integer   



  

    

Returns the Lilian day number, which is the number of days since the beginning of the Gregorian calendar, October 15, 1582.



Date.new(2001, 2, 3).ld # => 152784


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5301



static VALUE
d_lite_ld(VALUE self)
{
    get_d1(self);
    return f_sub(m_real_local_jd(dat), INT2FIX(2299160));
}


  








  

    #marshal_dump  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7554



static VALUE
d_lite_marshal_dump(VALUE self)
{
    VALUE a;

    get_d1(self);

    a = rb_ary_new3(6,
		    m_nth(dat),
		    INT2FIX(m_jd(dat)),
		    INT2FIX(m_df(dat)),
		    m_sf(dat),
		    INT2FIX(m_of(dat)),
		    DBL2NUM(m_sg(dat)));

    if (FL_TEST(self, FL_EXIVAR)) {
	rb_copy_generic_ivar(a, self);
	FL_SET(a, FL_EXIVAR);
    }

    return a;
}


  








  

    #marshal_dump_old  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7532



static VALUE
d_lite_marshal_dump_old(VALUE self)
{
    VALUE a;

    get_d1(self);

    a = rb_ary_new3(3,
		    m_ajd(dat),
		    m_of_in_day(dat),
		    DBL2NUM(m_sg(dat)));

    if (FL_TEST(self, FL_EXIVAR)) {
	rb_copy_generic_ivar(a, self);
	FL_SET(a, FL_EXIVAR);
    }

    return a;
}


  








  

    #marshal_load(a)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7578



static VALUE
d_lite_marshal_load(VALUE self, VALUE a)
{
    VALUE nth, sf;
    int jd, df, of;
    double sg;

    get_d1(self);

    rb_check_frozen(self);

    if (!RB_TYPE_P(a, T_ARRAY))
	rb_raise(rb_eTypeError, "expected an array");

    switch (RARRAY_LEN(a)) {
      case 2: /* 1.6.x */
      case 3: /* 1.8.x, 1.9.2 */
	{
	    VALUE ajd, vof, vsg;

	    if  (RARRAY_LEN(a) == 2) {
		ajd = f_sub(RARRAY_AREF(a, 0), half_days_in_day);
		vof = INT2FIX(0);
		vsg = RARRAY_AREF(a, 1);
		if (!k_numeric_p(vsg))
		    vsg = DBL2NUM(RTEST(vsg) ? GREGORIAN : JULIAN);
	    }
	    else {
		ajd = RARRAY_AREF(a, 0);
		vof = RARRAY_AREF(a, 1);
		vsg = RARRAY_AREF(a, 2);
	    }

	    old_to_new(ajd, vof, vsg,
		       &nth, &jd, &df, &sf, &of, &sg);
	}
	break;
      case 6:
	{
	    nth = RARRAY_AREF(a, 0);
	    jd = NUM2INT(RARRAY_AREF(a, 1));
	    df = NUM2INT(RARRAY_AREF(a, 2));
	    sf = RARRAY_AREF(a, 3);
	    of = NUM2INT(RARRAY_AREF(a, 4));
	    sg = NUM2DBL(RARRAY_AREF(a, 5));
	}
	break;
      default:
	rb_raise(rb_eTypeError, "invalid size");
	break;
    }

    if (simple_dat_p(dat)) {
	if (df || !f_zero_p(sf) || of) {
	    /* loading a fractional date; promote to complex */
	    dat = ruby_xrealloc(dat, sizeof(struct ComplexDateData));
	    RTYPEDDATA(self)->data = dat;
	    goto complex_data;
	}
	set_to_simple(self, &dat->s, nth, jd, sg, 0, 0, 0, HAVE_JD);
    } else {
      complex_data:
	set_to_complex(self, &dat->c, nth, jd, df, sf, of, sg,
		       0, 0, 0, 0, 0, 0,
		       HAVE_JD | HAVE_DF);
    }

    if (FL_TEST(a, FL_EXIVAR)) {
	rb_copy_generic_ivar(self, a);
	FL_SET(self, FL_EXIVAR);
    }

    return self;
}


  








  

    

      #day  ⇒ Integer 
      #mday  ⇒ Integer 
    

  



  

    

Alias for #day.


  





  








  

    #min   (private)
    Also known as: #hour, #minute, #sec, #second
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9492



static VALUE
d_lite_zero(VALUE x)
{
    return INT2FIX(0);
}


  








  

    #minute   (private)
  



  

    

Alias for #min.


  









  

    #mjd  ⇒ Integer   



  

    

Returns the modified Julian day number.  This is a whole number, which is adjusted by the offset as the local time.



DateTime.new(2001,2,3,4,5,6,'+7').mjd     #=> 51943
DateTime.new(2001,2,3,4,5,6,'-7').mjd     #=> 51943


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5282



static VALUE
d_lite_mjd(VALUE self)
{
    get_d1(self);
    return f_sub(m_real_local_jd(dat), INT2FIX(2400001));
}


  








  

    #mon  ⇒ Integer     Also known as: #month
  



  

    

Returns the month in range (1..12):



Date.new(2001, 2, 3).mon # => 2



#month is an alias for mon.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5351



static VALUE
d_lite_mon(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_mon(dat));
}


  








  

    

      #mon  ⇒ Integer 
      #month  ⇒ Integer 
    

  



  

    

Alias for #mon.


  





  








  

    #new_start(start = Date::ITALY])  ⇒ Date   



  

    

Returns a copy of self with the given #start value:



d0 = Date.new(2000, 2, 3)
d0.julian? # => false
d1 = d0.new_start(Date::JULIAN)
d1.julian? # => true



See argument start.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5848



static VALUE
d_lite_new_start(int argc, VALUE *argv, VALUE self)
{
    VALUE vsg;
    double sg;

    rb_scan_args(argc, argv, "01", &vsg);

    sg = DEFAULT_SG;
    if (argc >= 1)
	val2sg(vsg, sg);

    return dup_obj_with_new_start(self, sg);
}


  








  

    #next  ⇒ Date     Also known as: #succ
  



  

    

Returns a new Date object representing the following day:



d = Date.new(2001, 2, 3)
d.to_s      # => "2001-02-03"
d.next.to_s # => "2001-02-04"



#succ is an alias for next.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6429



static VALUE
d_lite_next(VALUE self)
{
    return d_lite_next_day(0, (VALUE *)NULL, self);
}


  








  

    #next_day(n = 1)  ⇒ Date   



  

    

Equivalent to #+ with argument n.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6389



static VALUE
d_lite_next_day(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
	n = INT2FIX(1);
    return d_lite_plus(self, n);
}


  








  

    #next_month(n = 1)  ⇒ Date   



  

    

Equivalent to #>> with argument n.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6541



static VALUE
d_lite_next_month(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
	n = INT2FIX(1);
    return d_lite_rshift(self, n);
}


  








  

    #next_year(n = 1)  ⇒ Date   



  

    

Equivalent to #>> with argument n * 12.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6575



static VALUE
d_lite_next_year(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
	n = INT2FIX(1);
    return d_lite_rshift(self, f_mul(n, INT2FIX(12)));
}


  








  

    #nth_kday?(n, k)  ⇒ Boolean 
  

  

    This method is for internal use only.
  



  

    
  





  


  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5573



static VALUE
d_lite_nth_kday_p(VALUE self, VALUE n, VALUE k)
{
    int rjd, ns;

    get_d1(self);

    if (NUM2INT(k) != m_wday(dat))
	return Qfalse;

    c_nth_kday_to_jd(m_year(dat), m_mon(dat),
		     NUM2INT(n), NUM2INT(k), m_virtual_sg(dat), /* !=m_sg() */
		     &rjd, &ns);
    if (m_local_jd(dat) != rjd)
	return Qfalse;
    return Qtrue;
}


  








  

    #prev_day(n = 1)  ⇒ Date   



  

    

Equivalent to #- with argument n.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6406



static VALUE
d_lite_prev_day(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
	n = INT2FIX(1);
    return d_lite_minus(self, n);
}


  








  

    #prev_month(n = 1)  ⇒ Date   



  

    

Equivalent to #<< with argument n.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6558



static VALUE
d_lite_prev_month(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
	n = INT2FIX(1);
    return d_lite_lshift(self, n);
}


  








  

    #prev_year(n = 1)  ⇒ Date   



  

    

Equivalent to #<< with argument n * 12.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6592



static VALUE
d_lite_prev_year(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
	n = INT2FIX(1);
    return d_lite_lshift(self, f_mul(n, INT2FIX(12)));
}


  








  

    

      #rfc822  ⇒ String 
      #rfc2822  ⇒ String 
    

  



  

    

Alias for #rfc822.


  





  








  

    #rfc3339  ⇒ String   



  

    

Equivalent to #strftime with argument '%FT%T%:z'; see Formats for Dates and Times:



Date.new(2001, 2, 3).rfc3339 # => "2001-02-03T00:00:00+00:00"


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7337



static VALUE
d_lite_rfc3339(VALUE self)
{
    return strftimev("%Y-%m-%dT%H:%M:%S%:z", self, set_tmx);
}


  








  

    #rfc822  ⇒ String     Also known as: #rfc2822
  



  

    

Equivalent to #strftime with argument '%a, %-d %b %Y %T %z'; see Formats for Dates and Times:



Date.new(2001, 2, 3).rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"



rfc822 is an alias for #rfc2822.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7354



static VALUE
d_lite_rfc2822(VALUE self)
{
    return strftimev("%a, %-d %b %Y %T %z", self, set_tmx);
}


  








  

    #sec   (private)
  



  

    

Alias for #min.


  









  

    #second   (private)
  



  

    

Alias for #min.


  









  

    #start  ⇒ Float   



  

    

Returns the Julian start date for calendar reform; if not an infinity, the returned value is suitable for passing to #jd:



d = Date.new(2001, 2, 3, Date::ITALY)
s = d.start     # => 2299161.0
Date.jd(s).to_s # => "1582-10-15"

d = Date.new(2001, 2, 3, Date::ENGLAND)
s = d.start     # => 2361222.0
Date.jd(s).to_s # => "1752-09-14"

Date.new(2001, 2, 3, Date::GREGORIAN).start # => -Infinity
Date.new(2001, 2, 3, Date::JULIAN).start    # => Infinity



See argument start.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5773



static VALUE
d_lite_start(VALUE self)
{
    get_d1(self);
    return DBL2NUM(m_sg(dat));
}


  








  

    #step(limit, step = 1) {|date| ... } ⇒ self   



  

    

Calls the block with specified dates; returns self.


  • 

    The first date is self.
    

  • 

    Each successive date is date + step, where step is the numeric step size in days.
    

  • 

    The last date is the last one that is before or equal to limit, which should be a Date object.
    




Example:



limit = Date.new(2001, 12, 31)
Date.new(2001).step(limit){|date| p date.to_s if date.mday == 31 }



Output:



"2001-01-31"
"2001-03-31"
"2001-05-31"
"2001-07-31"
"2001-08-31"
"2001-10-31"
"2001-12-31"



Returns an Enumerator if no block is given.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6635



static VALUE
d_lite_step(int argc, VALUE *argv, VALUE self)
{
    VALUE limit, step, date;
    int c;

    rb_scan_args(argc, argv, "11", &limit, &step);

    if (argc < 2)
	step = INT2FIX(1);

#if 0
    if (f_zero_p(step))
	rb_raise(rb_eArgError, "step can't be 0");
#endif

    RETURN_ENUMERATOR(self, argc, argv);

    date = self;
    c = f_cmp(step, INT2FIX(0));
    if (c < 0) {
	while (FIX2INT(d_lite_cmp(date, limit)) >= 0) {
	    rb_yield(date);
	    date = d_lite_plus(date, step);
	}
    }
    else if (c == 0) {
	while (1)
	    rb_yield(date);
    }
    else /* if (c > 0) */ {
	while (FIX2INT(d_lite_cmp(date, limit)) <= 0) {
	    rb_yield(date);
	    date = d_lite_plus(date, step);
	}
    }
    return self;
}


  








  

    #strftime(format = '%F')  ⇒ String   



  

    

Returns a string representation of the date in self, formatted according the given format:



Date.new(2001, 2, 3).strftime # => "2001-02-03"



For other formats, see Formats for Dates and Times.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 7265



static VALUE
d_lite_strftime(int argc, VALUE *argv, VALUE self)
{
    return date_strftime_internal(argc, argv, self,
				  "%Y-%m-%d", set_tmx);
}


  








  

    

      #next  ⇒ Date 
      #succ  ⇒ Date 
    

  



  

    

Alias for #next.


  





  








  

    #to_date  ⇒ self   



  

    

Returns self.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9003



static VALUE
date_to_date(VALUE self)
{
    return self;
}


  








  

    #to_datetime  ⇒ Date   



  

    

Returns a ::Time whose value is the same as self:



Date.new(2001, 2, 3).to_datetime # => #<DateTime: 2001-02-03T00:00:00+00:00>


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 9018



static VALUE
date_to_datetime(VALUE self)
{
    get_d1a(self);

    if (simple_dat_p(adat)) {
	VALUE new = d_lite_s_alloc_simple(cDateTime);
	{
	    get_d1b(new);
	    bdat->s = adat->s;
	    return new;
	}
    }
    else {
	VALUE new = d_lite_s_alloc_complex(cDateTime);
	{
	    get_d1b(new);
	    bdat->c = adat->c;
	    bdat->c.df = 0;
	    RB_OBJ_WRITE(new, &bdat->c.sf, INT2FIX(0));
#ifndef USE_PACK
	    bdat->c.hour = 0;
	    bdat->c.min = 0;
	    bdat->c.sec = 0;
#else
	    bdat->c.pc = PACK5(EX_MON(adat->c.pc), EX_MDAY(adat->c.pc),
			       0, 0, 0);
	    bdat->c.flags |= HAVE_DF | HAVE_TIME;
#endif
	    return new;
	}
    }
}


  








  

    #to_s  ⇒ String   



  

    

Returns a string representation of the date in self in ISO 8601 extended date format ('%Y-%m-%d'):



Date.new(2001, 2, 3).to_s # => "2001-02-03"


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6987



static VALUE
d_lite_to_s(VALUE self)
{
    return strftimev("%Y-%m-%d", self, set_tmx);
}


  








  

    #to_time  ⇒ Time   



  

    

Returns a new ::Time object with the same value as self; if self is a Julian date, derives its Gregorian date for conversion to the Time object:



Date.new(2001, 2, 3).to_time               # => 2001-02-03 00:00:00 -0600
Date.new(2001, 2, 3, Date::JULIAN).to_time # => 2001-02-16 00:00:00 -0600


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 8980



static VALUE
date_to_time(VALUE self)
{
    get_d1a(self);

    if (m_julian_p(adat)) {
        VALUE tmp = d_lite_gregorian(self);
        get_d1b(tmp);
        adat = bdat;
    }

    return f_local3(rb_cTime,
        m_real_year(adat),
        INT2FIX(m_mon(adat)),
        INT2FIX(m_mday(adat)));
}


  








  

    #upto(max) {|date| ... } ⇒ self   



  

    

Equivalent to #step with arguments max and 1.


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 6680



static VALUE
d_lite_upto(VALUE self, VALUE max)
{
    VALUE date;

    RETURN_ENUMERATOR(self, 1, &max);

    date = self;
    while (FIX2INT(d_lite_cmp(date, max)) <= 0) {
	rb_yield(date);
	date = d_lite_plus(date, INT2FIX(1));
    }
    return self;
}


  








  

    #wday  ⇒ Integer   



  

    

Returns the day of week in range (0..6); Sunday is 0:



Date.new(2001, 2, 3).wday # => 6


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5473



static VALUE
d_lite_wday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_wday(dat));
}


  








  

    #wnum0   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5448



static VALUE
d_lite_wnum0(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_wnum0(dat));
}


  








  

    #wnum1   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5456



static VALUE
d_lite_wnum1(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_wnum1(dat));
}


  








  

    

      #iso8601  ⇒ String 
      #xmlschema  ⇒ String 
    

  



  

    

Alias for #iso8601.


  





  








  

    #yday  ⇒ Integer   



  

    

Returns the day of the year, in range (1..366):



Date.new(2001, 2, 3).yday # => 34


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5334



static VALUE
d_lite_yday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_yday(dat));
}


  








  

    #year  ⇒ Integer   



  

    

Returns the year:



Date.new(2001, 2, 3).year    # => 2001
(Date.new(1, 1, 1) - 1).year # => 0


  



  [ GitHub ]


  

  


# File 'ext/date/date_core.c', line 5318



static VALUE
d_lite_year(VALUE self)
{
    get_d1(self);
    return m_real_year(dat);
}