Class: ActiveSupport::TimeZone
- Includes:
- Comparable
- Defined in:
- lib/active_support/values/time_zone.rb
Overview
The TimeZone class serves as a wrapper around TZInfo::Timezone instances. It allows us to do the following:
-
Limit the set of zones provided by TZInfo to a meaningful subset of 146 zones.
-
Retrieve and display zones with a friendlier name (e.g., “Eastern Time (US & Canada)” instead of “America/New_York”).
-
Lazily load TZInfo::Timezone instances only when they’re needed.
-
Create ActiveSupport::TimeWithZone instances via TimeZone’s
local
,parse
,at
andnow
methods.
If you set config.time_zone
in the Rails Application, you can access this TimeZone object via Time.zone
:
# application.rb:
class Application < Rails::Application
config.time_zone = 'Eastern Time (US & Canada)'
end
Time.zone # => #<ActiveSupport::TimeZone:0x514834...>
Time.zone.name # => "Eastern Time (US & Canada)"
Time.zone.now # => Sun, 18 May 2008 14:30:44 EDT -04:00
Constant Summary collapse
- MAPPING =
Keys are Rails TimeZone names, values are TZInfo identifiers.
{ "International Date Line West" => "Pacific/Midway", "Midway Island" => "Pacific/Midway", "American Samoa" => "Pacific/Pago_Pago", "Hawaii" => "Pacific/Honolulu", "Alaska" => "America/Juneau", "Pacific Time (US & Canada)" => "America/Los_Angeles", "Tijuana" => "America/Tijuana", "Mountain Time (US & Canada)" => "America/Denver", "Arizona" => "America/Phoenix", "Chihuahua" => "America/Chihuahua", "Mazatlan" => "America/Mazatlan", "Central Time (US & Canada)" => "America/Chicago", "Saskatchewan" => "America/Regina", "Guadalajara" => "America/Mexico_City", "Mexico City" => "America/Mexico_City", "Monterrey" => "America/Monterrey", "Central America" => "America/Guatemala", "Eastern Time (US & Canada)" => "America/New_York", "Indiana (East)" => "America/Indiana/Indianapolis", "Bogota" => "America/Bogota", "Lima" => "America/Lima", "Quito" => "America/Lima", "Atlantic Time (Canada)" => "America/Halifax", "Caracas" => "America/Caracas", "La Paz" => "America/La_Paz", "Santiago" => "America/Santiago", "Newfoundland" => "America/St_Johns", "Brasilia" => "America/Sao_Paulo", "Buenos Aires" => "America/Argentina/Buenos_Aires", "Montevideo" => "America/Montevideo", "Georgetown" => "America/Guyana", "Greenland" => "America/Godthab", "Mid-Atlantic" => "Atlantic/South_Georgia", "Azores" => "Atlantic/Azores", "Cape Verde Is." => "Atlantic/Cape_Verde", "Dublin" => "Europe/Dublin", "Edinburgh" => "Europe/London", "Lisbon" => "Europe/Lisbon", "London" => "Europe/London", "Casablanca" => "Africa/Casablanca", "Monrovia" => "Africa/Monrovia", "UTC" => "Etc/UTC", "Belgrade" => "Europe/Belgrade", "Bratislava" => "Europe/Bratislava", "Budapest" => "Europe/Budapest", "Ljubljana" => "Europe/Ljubljana", "Prague" => "Europe/Prague", "Sarajevo" => "Europe/Sarajevo", "Skopje" => "Europe/Skopje", "Warsaw" => "Europe/Warsaw", "Zagreb" => "Europe/Zagreb", "Brussels" => "Europe/Brussels", "Copenhagen" => "Europe/Copenhagen", "Madrid" => "Europe/Madrid", "Paris" => "Europe/Paris", "Amsterdam" => "Europe/Amsterdam", "Berlin" => "Europe/Berlin", "Bern" => "Europe/Zurich", "Zurich" => "Europe/Zurich", "Rome" => "Europe/Rome", "Stockholm" => "Europe/Stockholm", "Vienna" => "Europe/Vienna", "West Central Africa" => "Africa/Algiers", "Bucharest" => "Europe/Bucharest", "Cairo" => "Africa/Cairo", "Helsinki" => "Europe/Helsinki", "Kyiv" => "Europe/Kiev", "Riga" => "Europe/Riga", "Sofia" => "Europe/Sofia", "Tallinn" => "Europe/Tallinn", "Vilnius" => "Europe/Vilnius", "Athens" => "Europe/Athens", "Istanbul" => "Europe/Istanbul", "Minsk" => "Europe/Minsk", "Jerusalem" => "Asia/Jerusalem", "Harare" => "Africa/Harare", "Pretoria" => "Africa/Johannesburg", "Kaliningrad" => "Europe/Kaliningrad", "Moscow" => "Europe/Moscow", "St. Petersburg" => "Europe/Moscow", "Volgograd" => "Europe/Volgograd", "Samara" => "Europe/Samara", "Kuwait" => "Asia/Kuwait", "Riyadh" => "Asia/Riyadh", "Nairobi" => "Africa/Nairobi", "Baghdad" => "Asia/Baghdad", "Tehran" => "Asia/Tehran", "Abu Dhabi" => "Asia/Muscat", "Muscat" => "Asia/Muscat", "Baku" => "Asia/Baku", "Tbilisi" => "Asia/Tbilisi", "Yerevan" => "Asia/Yerevan", "Kabul" => "Asia/Kabul", "Ekaterinburg" => "Asia/Yekaterinburg", "Islamabad" => "Asia/Karachi", "Karachi" => "Asia/Karachi", "Tashkent" => "Asia/Tashkent", "Chennai" => "Asia/Kolkata", "Kolkata" => "Asia/Kolkata", "Mumbai" => "Asia/Kolkata", "New Delhi" => "Asia/Kolkata", "Kathmandu" => "Asia/Kathmandu", "Astana" => "Asia/Dhaka", "Dhaka" => "Asia/Dhaka", "Sri Jayawardenepura" => "Asia/Colombo", "Almaty" => "Asia/Almaty", "Novosibirsk" => "Asia/Novosibirsk", "Rangoon" => "Asia/Rangoon", "Bangkok" => "Asia/Bangkok", "Hanoi" => "Asia/Bangkok", "Jakarta" => "Asia/Jakarta", "Krasnoyarsk" => "Asia/Krasnoyarsk", "Beijing" => "Asia/Shanghai", "Chongqing" => "Asia/Chongqing", "Hong Kong" => "Asia/Hong_Kong", "Urumqi" => "Asia/Urumqi", "Kuala Lumpur" => "Asia/Kuala_Lumpur", "Singapore" => "Asia/Singapore", "Taipei" => "Asia/Taipei", "Perth" => "Australia/Perth", "Irkutsk" => "Asia/Irkutsk", "Ulaanbaatar" => "Asia/Ulaanbaatar", "Seoul" => "Asia/Seoul", "Osaka" => "Asia/Tokyo", "Sapporo" => "Asia/Tokyo", "Tokyo" => "Asia/Tokyo", "Yakutsk" => "Asia/Yakutsk", "Darwin" => "Australia/Darwin", "Adelaide" => "Australia/Adelaide", "Canberra" => "Australia/Melbourne", "Melbourne" => "Australia/Melbourne", "Sydney" => "Australia/Sydney", "Brisbane" => "Australia/Brisbane", "Hobart" => "Australia/Hobart", "Vladivostok" => "Asia/Vladivostok", "Guam" => "Pacific/Guam", "Port Moresby" => "Pacific/Port_Moresby", "Magadan" => "Asia/Magadan", "Srednekolymsk" => "Asia/Srednekolymsk", "Solomon Is." => "Pacific/Guadalcanal", "New Caledonia" => "Pacific/Noumea", "Fiji" => "Pacific/Fiji", "Kamchatka" => "Asia/Kamchatka", "Marshall Is." => "Pacific/Majuro", "Auckland" => "Pacific/Auckland", "Wellington" => "Pacific/Auckland", "Nuku'alofa" => "Pacific/Tongatapu", "Tokelau Is." => "Pacific/Fakaofo", "Chatham Is." => "Pacific/Chatham", "Samoa" => "Pacific/Apia" }
- UTC_OFFSET_WITH_COLON =
"%s%02d:%02d"
- UTC_OFFSET_WITHOUT_COLON =
UTC_OFFSET_WITH_COLON.tr(":", "")
Instance Attribute Summary collapse
-
#name ⇒ Object
readonly
Returns the value of attribute name.
-
#tzinfo ⇒ Object
readonly
Returns the value of attribute tzinfo.
Class Method Summary collapse
-
.[](arg) ⇒ Object
Locate a specific time zone object.
-
.all ⇒ Object
Returns an array of all TimeZone objects.
-
.country_zones(country_code) ⇒ Object
A convenience method for returning a collection of TimeZone objects for time zones in the country specified by its ISO 3166-1 Alpha2 code.
- .create ⇒ Object
- .find_tzinfo(name) ⇒ Object
-
.new(name) ⇒ Object
Returns a TimeZone instance with the given name, or
nil
if no such TimeZone instance exists. -
.seconds_to_utc_offset(seconds, colon = true) ⇒ Object
Assumes self represents an offset from UTC in seconds (as returned from Time#utc_offset) and turns this into an +HH:MM formatted string.
-
.us_zones ⇒ Object
A convenience method for returning a collection of TimeZone objects for time zones in the USA.
Instance Method Summary collapse
-
#<=>(zone) ⇒ Object
Compare this time zone to the parameter.
-
#=~(re) ⇒ Object
Compare #name and TZInfo identifier to a supplied regexp, returning
true
if a match is found. -
#at(secs) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of
self
from number of seconds since the Unix epoch. -
#encode_with(coder) ⇒ Object
:nodoc:.
-
#formatted_offset(colon = true, alternate_utc_string = nil) ⇒ Object
Returns a formatted string of the offset from UTC, or an alternative string if the time zone is already UTC.
-
#init_with(coder) ⇒ Object
:nodoc:.
-
#initialize(name, utc_offset = nil, tzinfo = nil) ⇒ TimeZone
constructor
Create a new TimeZone object with the given name and offset.
-
#iso8601(str) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of
self
from an ISO 8601 string. -
#local(*args) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of
self
from given values. -
#local_to_utc(time, dst = true) ⇒ Object
Adjust the given time to the simultaneous time in UTC.
-
#now ⇒ Object
Returns an ActiveSupport::TimeWithZone instance representing the current time in the time zone represented by
self
. -
#parse(str, now = now()) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of
self
from parsed string. -
#period_for_local(time, dst = true) ⇒ Object
Available so that TimeZone instances respond like TZInfo::Timezone instances.
-
#period_for_utc(time) ⇒ Object
Available so that TimeZone instances respond like TZInfo::Timezone instances.
-
#periods_for_local(time) ⇒ Object
:nodoc:.
-
#rfc3339(str) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of
self
from an RFC 3339 string. -
#strptime(str, format, now = now()) ⇒ Object
Parses
str
according toformat
and returns an ActiveSupport::TimeWithZone. -
#to_s ⇒ Object
Returns a textual representation of this time zone.
-
#today ⇒ Object
Returns the current date in this time zone.
-
#tomorrow ⇒ Object
Returns the next date in this time zone.
-
#utc_offset ⇒ Object
Returns the offset of this time zone from UTC in seconds.
-
#utc_to_local(time) ⇒ Object
Adjust the given time to the simultaneous time in the time zone represented by
self
. -
#yesterday ⇒ Object
Returns the previous date in this time zone.
Constructor Details
#initialize(name, utc_offset = nil, tzinfo = nil) ⇒ TimeZone
Create a new TimeZone object with the given name and offset. The offset is the number of seconds that this time zone is offset from UTC (GMT). Seconds were chosen as the offset unit because that is the unit that Ruby uses to represent time zone offsets (see Time#utc_offset).
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# File 'lib/active_support/values/time_zone.rb', line 287 def initialize(name, utc_offset = nil, tzinfo = nil) @name = name @utc_offset = utc_offset @tzinfo = tzinfo || TimeZone.find_tzinfo(name) end |
Instance Attribute Details
#name ⇒ Object (readonly)
Returns the value of attribute name.
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# File 'lib/active_support/values/time_zone.rb', line 280 def name @name end |
#tzinfo ⇒ Object (readonly)
Returns the value of attribute tzinfo.
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# File 'lib/active_support/values/time_zone.rb', line 281 def tzinfo @tzinfo end |
Class Method Details
.[](arg) ⇒ Object
Locate a specific time zone object. If the argument is a string, it is interpreted to mean the name of the timezone to locate. If it is a numeric value it is either the hour offset, or the second offset, of the timezone to find. (The first one with that offset will be returned.) Returns nil
if no such time zone is known to the system.
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# File 'lib/active_support/values/time_zone.rb', line 227 def [](arg) case arg when String begin @lazy_zones_map[arg] ||= create(arg) rescue TZInfo::InvalidTimezoneIdentifier nil end when Numeric, ActiveSupport::Duration arg *= 3600 if arg.abs <= 13 all.find { |z| z.utc_offset == arg.to_i } else raise ArgumentError, "invalid argument to TimeZone[]: #{arg.inspect}" end end |
.all ⇒ Object
Returns an array of all TimeZone objects. There are multiple TimeZone objects per time zone, in many cases, to make it easier for users to find their own time zone.
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# File 'lib/active_support/values/time_zone.rb', line 218 def all @zones ||= zones_map.values.sort end |
.country_zones(country_code) ⇒ Object
A convenience method for returning a collection of TimeZone objects for time zones in the country specified by its ISO 3166-1 Alpha2 code.
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# File 'lib/active_support/values/time_zone.rb', line 251 def country_zones(country_code) code = country_code.to_s.upcase @country_zones[code] ||= load_country_zones(code) end |
.create ⇒ Object
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# File 'lib/active_support/values/time_zone.rb', line 206 alias_method :create, :new |
.find_tzinfo(name) ⇒ Object
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# File 'lib/active_support/values/time_zone.rb', line 202 def find_tzinfo(name) TZInfo::Timezone.new(MAPPING[name] || name) end |
.new(name) ⇒ Object
Returns a TimeZone instance with the given name, or nil
if no such TimeZone instance exists. (This exists to support the use of this class with the composed_of
macro.)
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# File 'lib/active_support/values/time_zone.rb', line 211 def new(name) self[name] end |
.seconds_to_utc_offset(seconds, colon = true) ⇒ Object
Assumes self represents an offset from UTC in seconds (as returned from Time#utc_offset) and turns this into an +HH:MM formatted string.
ActiveSupport::TimeZone.seconds_to_utc_offset(-21_600) # => "-06:00"
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# File 'lib/active_support/values/time_zone.rb', line 194 def seconds_to_utc_offset(seconds, colon = true) format = colon ? UTC_OFFSET_WITH_COLON : UTC_OFFSET_WITHOUT_COLON sign = (seconds < 0 ? "-" : "+") hours = seconds.abs / 3600 minutes = (seconds.abs % 3600) / 60 format % [sign, hours, minutes] end |
.us_zones ⇒ Object
A convenience method for returning a collection of TimeZone objects for time zones in the USA.
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# File 'lib/active_support/values/time_zone.rb', line 245 def us_zones country_zones(:us) end |
Instance Method Details
#<=>(zone) ⇒ Object
Compare this time zone to the parameter. The two are compared first on their offsets, and then by name.
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# File 'lib/active_support/values/time_zone.rb', line 314 def <=>(zone) return unless zone.respond_to? :utc_offset result = (utc_offset <=> zone.utc_offset) result = (name <=> zone.name) if result == 0 result end |
#=~(re) ⇒ Object
Compare #name and TZInfo identifier to a supplied regexp, returning true
if a match is found.
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# File 'lib/active_support/values/time_zone.rb', line 323 def =~(re) re === name || re === MAPPING[name] end |
#at(secs) ⇒ Object
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# File 'lib/active_support/values/time_zone.rb', line 348 def at(secs) Time.at(secs).utc.in_time_zone(self) end |
#encode_with(coder) ⇒ Object
:nodoc:
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# File 'lib/active_support/values/time_zone.rb', line 518 def encode_with(coder) #:nodoc: coder.tag = "!ruby/object:#{self.class}" coder.map = { "name" => tzinfo.name } end |
#formatted_offset(colon = true, alternate_utc_string = nil) ⇒ Object
Returns a formatted string of the offset from UTC, or an alternative string if the time zone is already UTC.
zone = ActiveSupport::TimeZone['Central Time (US & Canada)']
zone.formatted_offset # => "-06:00"
zone.formatted_offset(false) # => "-0600"
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# File 'lib/active_support/values/time_zone.rb', line 308 def formatted_offset(colon = true, alternate_utc_string = nil) utc_offset == 0 && alternate_utc_string || self.class.seconds_to_utc_offset(utc_offset, colon) end |
#init_with(coder) ⇒ Object
:nodoc:
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# File 'lib/active_support/values/time_zone.rb', line 514 def init_with(coder) #:nodoc: initialize(coder["name"]) end |
#iso8601(str) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of self
from an ISO 8601 string.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.iso8601('1999-12-31T14:00:00') # => Fri, 31 Dec 1999 14:00:00 HST -10:00
If the time components are missing then they will be set to zero.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.iso8601('1999-12-31') # => Fri, 31 Dec 1999 00:00:00 HST -10:00
If the string is invalid then an ArgumentError
will be raised unlike parse
which returns nil
when given an invalid date string.
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# File 'lib/active_support/values/time_zone.rb', line 365 def iso8601(str) parts = Date._iso8601(str) raise ArgumentError, "invalid date" if parts.empty? time = Time.new( parts.fetch(:year), parts.fetch(:mon), parts.fetch(:mday), parts.fetch(:hour, 0), parts.fetch(:min, 0), parts.fetch(:sec, 0) + parts.fetch(:sec_fraction, 0), parts.fetch(:offset, 0) ) if parts[:offset] TimeWithZone.new(time.utc, self) else TimeWithZone.new(nil, self, time) end end |
#local(*args) ⇒ Object
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# File 'lib/active_support/values/time_zone.rb', line 337 def local(*args) time = Time.utc(*args) ActiveSupport::TimeWithZone.new(nil, self, time) end |
#local_to_utc(time, dst = true) ⇒ Object
Adjust the given time to the simultaneous time in UTC. Returns a Time.utc() instance.
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# File 'lib/active_support/values/time_zone.rb', line 494 def local_to_utc(time, dst = true) tzinfo.local_to_utc(time, dst) end |
#now ⇒ Object
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# File 'lib/active_support/values/time_zone.rb', line 466 def now time_now.utc.in_time_zone(self) end |
#parse(str, now = now()) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of self
from parsed string.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.parse('1999-12-31 14:00:00') # => Fri, 31 Dec 1999 14:00:00 HST -10:00
If upper components are missing from the string, they are supplied from TimeZone#now:
Time.zone.now # => Fri, 31 Dec 1999 14:00:00 HST -10:00
Time.zone.parse('22:30:00') # => Fri, 31 Dec 1999 22:30:00 HST -10:00
However, if the date component is not provided, but any other upper components are supplied, then the day of the month defaults to 1:
Time.zone.parse('Mar 2000') # => Wed, 01 Mar 2000 00:00:00 HST -10:00
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# File 'lib/active_support/values/time_zone.rb', line 403 def parse(str, now = now()) parts_to_time(Date._parse(str, false), now) end |
#period_for_local(time, dst = true) ⇒ Object
Available so that TimeZone instances respond like TZInfo::Timezone instances.
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# File 'lib/active_support/values/time_zone.rb', line 506 def period_for_local(time, dst = true) tzinfo.period_for_local(time, dst) end |
#period_for_utc(time) ⇒ Object
Available so that TimeZone instances respond like TZInfo::Timezone instances.
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# File 'lib/active_support/values/time_zone.rb', line 500 def period_for_utc(time) tzinfo.period_for_utc(time) end |
#periods_for_local(time) ⇒ Object
:nodoc:
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# File 'lib/active_support/values/time_zone.rb', line 510 def periods_for_local(time) #:nodoc: tzinfo.periods_for_local(time) end |
#rfc3339(str) ⇒ Object
Method for creating new ActiveSupport::TimeWithZone instance in time zone of self
from an RFC 3339 string.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.rfc3339('2000-01-01T00:00:00Z') # => Fri, 31 Dec 1999 14:00:00 HST -10:00
If the time or zone components are missing then an ArgumentError
will be raised. This is much stricter than either parse
or iso8601
which allow for missing components.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.rfc3339('1999-12-31') # => ArgumentError: invalid date
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# File 'lib/active_support/values/time_zone.rb', line 419 def rfc3339(str) parts = Date._rfc3339(str) raise ArgumentError, "invalid date" if parts.empty? time = Time.new( parts.fetch(:year), parts.fetch(:mon), parts.fetch(:mday), parts.fetch(:hour), parts.fetch(:min), parts.fetch(:sec) + parts.fetch(:sec_fraction, 0), parts.fetch(:offset) ) TimeWithZone.new(time.utc, self) end |
#strptime(str, format, now = now()) ⇒ Object
Parses str
according to format
and returns an ActiveSupport::TimeWithZone.
Assumes that str
is a time in the time zone self
, unless format
includes an explicit time zone. (This is the same behavior as parse
.) In either case, the returned TimeWithZone has the timezone of self
.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.strptime('1999-12-31 14:00:00', '%Y-%m-%d %H:%M:%S') # => Fri, 31 Dec 1999 14:00:00 HST -10:00
If upper components are missing from the string, they are supplied from TimeZone#now:
Time.zone.now # => Fri, 31 Dec 1999 14:00:00 HST -10:00
Time.zone.strptime('22:30:00', '%H:%M:%S') # => Fri, 31 Dec 1999 22:30:00 HST -10:00
However, if the date component is not provided, but any other upper components are supplied, then the day of the month defaults to 1:
Time.zone.strptime('Mar 2000', '%b %Y') # => Wed, 01 Mar 2000 00:00:00 HST -10:00
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# File 'lib/active_support/values/time_zone.rb', line 457 def strptime(str, format, now = now()) parts_to_time(DateTime._strptime(str, format), now) end |
#to_s ⇒ Object
Returns a textual representation of this time zone.
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# File 'lib/active_support/values/time_zone.rb', line 328 def to_s "(GMT#{formatted_offset}) #{name}" end |
#today ⇒ Object
Returns the current date in this time zone.
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# File 'lib/active_support/values/time_zone.rb', line 471 def today tzinfo.now.to_date end |
#tomorrow ⇒ Object
Returns the next date in this time zone.
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# File 'lib/active_support/values/time_zone.rb', line 476 def tomorrow today + 1 end |
#utc_offset ⇒ Object
Returns the offset of this time zone from UTC in seconds.
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# File 'lib/active_support/values/time_zone.rb', line 294 def utc_offset if @utc_offset @utc_offset else tzinfo.current_period.utc_offset if tzinfo && tzinfo.current_period end end |
#utc_to_local(time) ⇒ Object
Adjust the given time to the simultaneous time in the time zone represented by self
. Returns a Time.utc() instance – if you want an ActiveSupport::TimeWithZone instance, use Time#in_time_zone() instead.
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# File 'lib/active_support/values/time_zone.rb', line 488 def utc_to_local(time) tzinfo.utc_to_local(time) end |
#yesterday ⇒ Object
Returns the previous date in this time zone.
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# File 'lib/active_support/values/time_zone.rb', line 481 def yesterday today - 1 end |