Class: TZInfo::LinkedTimezone

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `InfoTimezone`, `Timezone`
Instance Chain: self, `InfoTimezone`, `Timezone`, Comparable
Inherits:	TZInfo::InfoTimezone Object TZInfo::Timezone TZInfo::InfoTimezone TZInfo::LinkedTimezone
Defined in:	lib/tzinfo/linked_timezone.rb

Overview

Represents time zones that are defined as a link to or alias for another time zone.

Class Attribute Summary

`Timezone` - Inherited

.default_dst	Returns the default value of the optional `dst` parameter of the `local_time`, `local_datetime` and `local_timestamp`, `local_to_utc` and `period_for_local` methods (`nil`, `true` or `false`).
.default_dst=	Sets the default value of the optional `dst` parameter of the `local_datetime`, `local_time`, `local_timestamp`, `local_to_utc` and `period_for_local` methods.

Class Method Summary

.new(info) ⇒ LinkedTimezone constructor

Initializes a new LinkedTimezone.

`InfoTimezone` - Inherited

.new	Initializes a new `InfoTimezone`.

`Timezone` - Inherited

._load	Loads a `Timezone` from the serialized representation returned by `_dump`.
.all	Returns an `Array` of all the available time zones.
.all_country_zone_identifiers	Returns an `Array` of the identifiers of all the time zones that are observed by at least one `Country`.
.all_country_zones	Returns an `Array` of all the time zones that are observed by at least one `Country`.
.all_data_zone_identifiers	time zones that are defined by offsets and transitions.
.all_data_zones	Returns an `Array` of all the available time zones that are defined by offsets and transitions.
.all_identifiers,
.all_linked_zone_identifiers	time zones that are defined as links to / aliases for other time zones.
.all_linked_zones	Returns an `Array` of all the available time zones that are defined as links to / aliases for other time zones.
.get	Returns a time zone by its IANA Time Zone Database identifier (e.g. `"Europe/London"` or `"America/Chicago"`).
.get_proxy	Returns a proxy for the time zone with the given identifier.
.data_source, .get_proxies

Instance Method Summary

#canonical_zone ⇒ Timezone

Returns the canonical Timezone instance for this LinkedTimezone.
#period_for(time) ⇒ TimezonePeriod

Returns the TimezonePeriod that is valid at a given time.
#periods_for_local(local_time) ⇒ Array<TimezonePeriod>

Returns the set of TimezonePeriods that are valid for the given local time as an Array.
#transitions_up_to(to, from = nil) ⇒ Array<TimezoneTransition>

Returns an Array of TimezoneTransition instances representing the times where the UTC offset of the timezone changes.

`Timezone` - Inherited

#<=>	Compares this `Timezone` with another based on the `identifier`.
#=~	Matches `regexp` against the `identifier` of this `Timezone`.
#_dump	Returns a serialized representation of this `Timezone`.
#abbr	Alias for Timezone#abbreviation.
#abbreviation,
#base_utc_offset	Returns the base offset from UTC in seconds at the given time.
#canonical_identifier	Returns the canonical identifier of this time zone.
#canonical_zone	Returns the canonical `Timezone` instance for this `Timezone`.
#current_period,
#current_period_and_time	Alias for Timezone#current_time_and_period.
#current_time_and_period	Returns the current local time and `TimezonePeriod` for the time zone as an `Array`.
#dst?, #eql?,
#friendly_identifier	Returns `identifier`, modified to make it more readable.
#hash, #identifier, #inspect,
#local_datetime	Creates a `DateTime` object based on the given (Gregorian calendar) date and time parameters.
#local_time	Creates a `Time` object based on the given (Gregorian calendar) date and time parameters.
#local_timestamp	Creates a `Timestamp` object based on the given (Gregorian calendar) date and time parameters.
#local_to_utc	Converts a local time for the time zone to UTC.
#name, #now,
#observed_utc_offset	Returns the observed offset from UTC in seconds at the given time.
#offsets_up_to	Returns the unique offsets used by the time zone up to a given time (`to`) as an `Array` of `TimezoneOffset` instances.
#period_for	Returns the `TimezonePeriod` that is valid at a given time.
#period_for_local	Returns the `TimezonePeriod` that is valid at the given local time.
#period_for_utc	Returns the `TimezonePeriod` that is valid at a given time.
#periods_for_local	Returns the set of `TimezonePeriod`s that are valid for the given local time as an `Array`.
#strftime	Converts a time to local time for the time zone and returns a `String` representation of the local time according to the given format.
#to_local	Converts a time to the local time for the time zone.
#to_s,
#transitions_up_to	Returns an `Array` of `TimezoneTransition` instances representing the times where the UTC offset of the timezone changes.
#utc_offset	Alias for Timezone#observed_utc_offset.
#utc_to_local	Converts a time in UTC to the local time for the time zone.
#raise_unknown_timezone	Raises an `UnknownTimezone` exception.

Constructor Details

.new(info) ⇒ `LinkedTimezone`

Initializes a new LinkedTimezone.

LinkedTimezone instances should not normally be created directly. Use the Timezone.get method to obtain Timezone instances.

Parameters:

info (DataSources::LinkedTimezoneInfo) —
a DataSources::LinkedTimezoneInfo instance supplied by a DataSource that will be used as the source of data for this LinkedTimezone.

[ GitHub ]

# File 'lib/tzinfo/linked_timezone.rb', line 15


def initialize(info)
  super
  @linked_timezone = Timezone.get(info.link_to_identifier)
end

Instance Method Details

#canonical_zone ⇒ Timezone

Returns the canonical Timezone instance for this LinkedTimezone.

For a LinkedTimezone, this is the canonical zone of the link target.

Returns:

(Timezone) —
the canonical Timezone instance for this Timezone.

[ GitHub ]

# File 'lib/tzinfo/linked_timezone.rb', line 40


def canonical_zone
  @linked_timezone.canonical_zone
end

#period_for(time) ⇒ TimezonePeriod

Returns the TimezonePeriod that is valid at a given time.

Unlike period_for_local and period_for_utc, the UTC offset of the time parameter is taken into consideration.

Parameters:

time (Object) —
a Time, DateTime or Timestamp.

Returns:

(TimezonePeriod) —
the TimezonePeriod that is valid at time.

Raises:

(ArgumentError) —
if time is nil.
(ArgumentError) —
if time is a Timestamp with an unspecified offset.

[ GitHub ]

# File 'lib/tzinfo/linked_timezone.rb', line 21


def period_for(time)
  @linked_timezone.period_for(time)
end

#periods_for_local(local_time) ⇒ `Array`<TimezonePeriod>

Returns the set of TimezonePeriods that are valid for the given local time as an Array.

The UTC offset of the local_time parameter is ignored (it is treated as a time in the time zone represented by self).

This will typically return an Array containing a single TimezonePeriod. More than one TimezonePeriod will be returned when the local time is ambiguous (for example, when daylight savings time ends). An empty Array will be returned when the local time is not valid (for example, when daylight savings time begins).

To obtain just a single TimezonePeriod in all cases, use period_for_local instead and specify how ambiguities should be resolved.

Parameters:

local_time (Object) —
a Time, DateTime or Timestamp.

Returns:

(Array<TimezonePeriod>) —
the set of TimezonePeriods that are valid at local_time.

Raises:

(ArgumentError) —
if local_time is nil.

[ GitHub ]

# File 'lib/tzinfo/linked_timezone.rb', line 26


def periods_for_local(local_time)
  @linked_timezone.periods_for_local(local_time)
end

#transitions_up_to(to, from = nil) ⇒ `Array`<TimezoneTransition>

Returns an Array of TimezoneTransition instances representing the times where the UTC offset of the timezone changes.

Transitions are returned up to a given time (to).

A from time may also be supplied using the from parameter. If from is not nil, only transitions from that time onwards will be returned.

Comparisons with to are exclusive. Comparisons with from are inclusive. If a transition falls precisely on to, it will be excluded. If a transition falls on from, it will be included.

Parameters:

to (Object) —
a Time, DateTime or Timestamp specifying the latest (exclusive) transition to return.
from (Object) (defaults to: nil) —
an optional Time, DateTime or Timestamp specifying the earliest (inclusive) transition to return.

Returns:

(Array<TimezoneTransition>) —
the transitions that are earlier than to and, if specified, at or later than from. Transitions are ordered by when they occur, from earliest to latest.

Raises:

(ArgumentError) —
if from is specified and to is not greater than from.
(ArgumentError) —
is raised if to is nil.
(ArgumentError) —
if either to or from is a Timestamp with an unspecified offset.

[ GitHub ]

# File 'lib/tzinfo/linked_timezone.rb', line 31


def transitions_up_to(to, from = nil)
  @linked_timezone.transitions_up_to(to, from)
end

Class: TZInfo::LinkedTimezone

Overview

Class Attribute Summary

Timezone - Inherited

Class Method Summary

InfoTimezone - Inherited

Timezone - Inherited

Instance Method Summary

InfoTimezone - Inherited

Timezone - Inherited

Constructor Details

.new(info) ⇒ LinkedTimezone

Instance Method Details

#canonical_zone ⇒ Timezone

#period_for(time) ⇒ TimezonePeriod

#periods_for_local(local_time) ⇒ Array<TimezonePeriod>

#transitions_up_to(to, from = nil) ⇒ Array<TimezoneTransition>

`Timezone` - Inherited

`InfoTimezone` - Inherited

`Timezone` - Inherited

`InfoTimezone` - Inherited

`Timezone` - Inherited

.new(info) ⇒ `LinkedTimezone`

#periods_for_local(local_time) ⇒ `Array`<TimezonePeriod>

#transitions_up_to(to, from = nil) ⇒ `Array`<TimezoneTransition>