Class: ActiveSupport::TimeZone

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
activesupport/lib/active_support/values/time_zone.rb

Constant Summary

MAPPING =

Keys are Rails TimeZone names, values are TZInfo identifiers

{
  "International Date Line West" => "Pacific/Midway",
  "Midway Island"                => "Pacific/Midway",
  "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",
  "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/Berlin",
  "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",
  "Moscow"                       => "Europe/Moscow",
  "St. Petersburg"               => "Europe/Moscow",
  "Volgograd"                    => "Europe/Moscow",
  "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",
  "Ulaan Bataar"                 => "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",
  "Solomon Is."                  => "Asia/Magadan",
  "New Caledonia"                => "Pacific/Noumea",
  "Fiji"                         => "Pacific/Fiji",
  "Kamchatka"                    => "Asia/Kamchatka",
  "Marshall Is."                 => "Pacific/Majuro",
  "Auckland"                     => "Pacific/Auckland",
  "Wellington"                   => "Pacific/Auckland",
  "Nuku'alofa"                   => "Pacific/Tongatapu"
}.each { |name, zone| name.freeze; zone.freeze }
UTC_OFFSET_WITH_COLON = 
'%s%02d:%02d'
UTC_OFFSET_WITHOUT_COLON = 
UTC_OFFSET_WITH_COLON.sub(':', '')

Instance Attribute Summary (collapse)

Class Method Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

- (TimeZone) initialize(name, utc_offset = nil, tzinfo = nil)

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).



197
198
199
200
201
202
203
204
205
206
207
208
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 197

def initialize(name, utc_offset = nil, tzinfo = nil)
  begin
    require 'tzinfo'
  rescue LoadError => e
    $stderr.puts "You don't have tzinfo installed in your application. Please add it to your Gemfile and run bundle install"
    raise e
  end
  @name = name
  @utc_offset = utc_offset
  @tzinfo = tzinfo || TimeZone.find_tzinfo(name)
  @current_period = nil
end

Instance Attribute Details

- (Object) name (readonly)

Returns the value of attribute name



190
191
192
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 190

def name
  @name
end

- (Object) tzinfo (readonly)

Returns the value of attribute tzinfo



191
192
193
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 191

def tzinfo
  @tzinfo
end

Class Method Details

+ (Object) [](arg)

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.



350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 350

def [](arg)
  case arg
    when String
    begin
      zones_map[arg] ||= lookup(arg).tap { |tz| tz.utc_offset }
    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

+ (Object) all

Return 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.



337
338
339
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 337

def all
  @zones ||= zones_map.values.sort
end

+ (Object) find_tzinfo(name)

TODO: Preload instead of lazy load for thread safety



319
320
321
322
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 319

def self.find_tzinfo(name)
  require 'active_support/tzinfo' unless defined?(::TZInfo)
  ::TZInfo::TimezoneProxy.new(MAPPING[name] || name)
end

+ (Object) new(name) Also known as: create

Return 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.)



330
331
332
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 330

def new(name)
  self[name]
end

+ (Object) seconds_to_utc_offset(seconds, colon = true)

Assumes self represents an offset from UTC in seconds (as returned from Time#utc_offset) and turns this into an +HH:MM formatted string. Example:

TimeZone.seconds_to_utc_offset(-21_600) # => "-06:00"


181
182
183
184
185
186
187
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 181

def self.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

+ (Object) us_zones

A convenience method for returning a collection of TimeZone objects for time zones in the USA.



368
369
370
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 368

def us_zones
  @us_zones ||= all.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ }
end

+ (Object) zones_map 



341
342
343
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 341

def zones_map
  @zones_map ||= Hash[MAPPING.map { |place, _| [place, create(place)] }]
end

Instance Method Details

- (Object) <=>(zone)

Compare this time zone to the parameter. The two are compared first on their offsets, and then by name.



227
228
229
230
231
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 227

def <=>(zone)
  result = (utc_offset <=> zone.utc_offset)
  result = (name <=> zone.name) if result == 0
  result
end

- (Object) =~(re)

Compare #name and TZInfo identifier to a supplied regexp, returning true if a match is found.



235
236
237
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 235

def =~(re)
  return true if name =~ re || MAPPING[name] =~ re
end

- (Object) at(secs)

Method for creating new ActiveSupport::TimeWithZone instance in time zone of self from number of seconds since the Unix epoch. Example:

Time.zone = "Hawaii"        # => "Hawaii"
Time.utc(2000).to_f         # => 946684800.0
Time.zone.at(946684800.0)   # => Fri, 31 Dec 1999 14:00:00 HST -10:00


258
259
260
261
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 258

def at(secs)
  utc = Time.at(secs).utc rescue DateTime.civil(1970).since(secs)
  utc.in_time_zone(self)
end

- (Object) formatted_offset(colon = true, alternate_utc_string = nil)

Returns the offset of this time zone as a formatted string, of the format "+HH:MM".



221
222
223
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 221

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

- (Object) local(*args)

Method for creating new ActiveSupport::TimeWithZone instance in time zone of self from given values. Example:

Time.zone = "Hawaii"                      # => "Hawaii"
Time.zone.local(2007, 2, 1, 15, 30, 45)   # => Thu, 01 Feb 2007 15:30:45 HST -10:00


248
249
250
251
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 248

def local(*args)
  time = Time.utc_time(*args)
  ActiveSupport::TimeWithZone.new(nil, self, time)
end

- (Object) local_to_utc(time, dst = true)

Adjust the given time to the simultaneous time in UTC. Returns a Time.utc() instance.



304
305
306
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 304

def local_to_utc(time, dst=true)
  tzinfo.local_to_utc(time, dst)
end

- (Object) now

Returns an ActiveSupport::TimeWithZone instance representing the current time in the time zone represented by self. Example:

Time.zone = 'Hawaii'  # => "Hawaii"
Time.zone.now         # => Wed, 23 Jan 2008 20:24:27 HST -10:00


288
289
290
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 288

def now
  Time.now.utc.in_time_zone(self)
end

- (Object) parse(str, now = now)

Method for creating new ActiveSupport::TimeWithZone instance in time zone of self from parsed string. Example:

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


272
273
274
275
276
277
278
279
280
281
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 272

def parse(str, now=now)
  date_parts = Date._parse(str)
  return if date_parts.blank?
  time = Time.parse(str, now) rescue DateTime.parse(str)
  if date_parts[:offset].nil?
    ActiveSupport::TimeWithZone.new(nil, self, time)
  else
    time.in_time_zone(self)
  end
end

- (Object) period_for_local(time, dst = true)

Available so that TimeZone instances respond like TZInfo::Timezone instances



314
315
316
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 314

def period_for_local(time, dst=true)
  tzinfo.period_for_local(time, dst)
end

- (Object) period_for_utc(time)

Available so that TimeZone instances respond like TZInfo::Timezone instances



309
310
311
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 309

def period_for_utc(time)
  tzinfo.period_for_utc(time)
end

- (Object) to_s

Returns a textual representation of this time zone.



240
241
242
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 240

def to_s
  "(GMT#{formatted_offset}) #{name}"
end

- (Object) today

Return the current date in this time zone.



293
294
295
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 293

def today
  tzinfo.now.to_date
end

- (Object) utc_offset 



210
211
212
213
214
215
216
217
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 210

def utc_offset
  if @utc_offset
    @utc_offset
  else
    @current_period ||= tzinfo.try(:current_period)
    @current_period.try(:utc_offset)
  end
end

- (Object) utc_to_local(time)

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.



299
300
301
 
# File 'activesupport/lib/active_support/values/time_zone.rb', line 299

def utc_to_local(time)
  tzinfo.utc_to_local(time)
end