-
Notifications
You must be signed in to change notification settings - Fork 21.6k
/
time_zone.rb
421 lines (394 loc) · 19.4 KB
/
time_zone.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
require 'active_support/core_ext/time'
require 'active_support/core_ext/date'
require 'active_support/core_ext/date_time'
# 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 142 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+ and +now+ methods.
#
# If you set <tt>config.time_zone</tt> in the Rails Initializer, you can access this TimeZone object via <tt>Time.zone</tt>:
#
# # environment.rb:
# Rails::Initializer.run do |config|
# config.time_zone = "Eastern Time (US & Canada)"
# end
#
# Time.zone # => #<TimeZone:0x514834...>
# Time.zone.name # => "Eastern Time (US & Canada)"
# Time.zone.now # => Sun, 18 May 2008 14:30:44 EDT -04:00
#
# The version of TZInfo bundled with Active Support only includes the definitions necessary to support the zones
# defined by the TimeZone class. If you need to use zones that aren't defined by TimeZone, you'll need to install the TZInfo gem
# (if a recent version of the gem is installed locally, this will be used instead of the bundled version.)
module ActiveSupport
class TimeZone
unless const_defined?(:MAPPING)
# Keys are Rails TimeZone names, values are TZInfo identifiers
MAPPING = {
"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/Argentina/San_Juan",
"Greenland" => "America/Godthab",
"Mid-Atlantic" => "Atlantic/South_Georgia",
"Azores" => "Atlantic/Azores",
"Cape Verde Is." => "Atlantic/Cape_Verde",
"Dublin" => "Europe/Dublin",
"Edinburgh" => "Europe/Dublin",
"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 }
MAPPING.freeze
end
UTC_OFFSET_WITH_COLON = '%+03d:%02d'
UTC_OFFSET_WITHOUT_COLON = UTC_OFFSET_WITH_COLON.sub(':', '')
# 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"
def self.seconds_to_utc_offset(seconds, colon = true)
format = colon ? UTC_OFFSET_WITH_COLON : UTC_OFFSET_WITHOUT_COLON
hours = seconds / 3600
minutes = (seconds.abs % 3600) / 60
format % [hours, minutes]
end
include Comparable
attr_reader :name
# 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).
def initialize(name, utc_offset, tzinfo = nil)
@name = name
@utc_offset = utc_offset
@tzinfo = tzinfo
end
def utc_offset
@utc_offset ||= tzinfo.current_period.utc_offset
end
# Returns the offset of this time zone as a formatted string, of the
# format "+HH:MM".
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
# Compare this time zone to the parameter. The two are comapred first on
# their offsets, and then by name.
def <=>(zone)
result = (utc_offset <=> zone.utc_offset)
result = (name <=> zone.name) if result == 0
result
end
# Compare #name and TZInfo identifier to a supplied regexp, returning true
# if a match is found.
def =~(re)
return true if name =~ re || MAPPING[name] =~ re
end
# Returns a textual representation of this time zone.
def to_s
"(GMT#{formatted_offset}) #{name}"
end
# 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
def local(*args)
time = Time.utc_time(*args)
ActiveSupport::TimeWithZone.new(nil, self, time)
end
# 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
def at(secs)
utc = Time.at(secs).utc rescue DateTime.civil(1970).since(secs)
utc.in_time_zone(self)
end
# 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
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
# 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
def now
Time.now.utc.in_time_zone(self)
end
# Return the current date in this time zone.
def today
tzinfo.now.to_date
end
# 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.
def utc_to_local(time)
tzinfo.utc_to_local(time)
end
# Adjust the given time to the simultaneous time in UTC. Returns a Time.utc() instance.
def local_to_utc(time, dst=true)
tzinfo.local_to_utc(time, dst)
end
# Available so that TimeZone instances respond like TZInfo::Timezone instances
def period_for_utc(time)
tzinfo.period_for_utc(time)
end
# Available so that TimeZone instances respond like TZInfo::Timezone instances
def period_for_local(time, dst=true)
tzinfo.period_for_local(time, dst)
end
# TODO: Preload instead of lazy load for thread safety
def tzinfo
require 'tzinfo' unless defined?(TZInfo)
@tzinfo ||= TZInfo::Timezone.get(MAPPING[name])
end
unless const_defined?(:ZONES)
ZONES = []
ZONES_MAP = {}
[[-39_600, "International Date Line West", "Midway Island", "Samoa" ],
[-36_000, "Hawaii" ],
[-32_400, "Alaska" ],
[-28_800, "Pacific Time (US & Canada)", "Tijuana" ],
[-25_200, "Mountain Time (US & Canada)", "Chihuahua", "Mazatlan",
"Arizona" ],
[-21_600, "Central Time (US & Canada)", "Saskatchewan", "Guadalajara",
"Mexico City", "Monterrey", "Central America" ],
[-18_000, "Eastern Time (US & Canada)", "Indiana (East)", "Bogota",
"Lima", "Quito" ],
[-16_200, "Caracas" ],
[-14_400, "Atlantic Time (Canada)", "La Paz", "Santiago" ],
[-12_600, "Newfoundland" ],
[-10_800, "Brasilia", "Buenos Aires", "Georgetown", "Greenland" ],
[ -7_200, "Mid-Atlantic" ],
[ -3_600, "Azores", "Cape Verde Is." ],
[ 0, "Dublin", "Edinburgh", "Lisbon", "London", "Casablanca",
"Monrovia", "UTC" ],
[ 3_600, "Belgrade", "Bratislava", "Budapest", "Ljubljana", "Prague",
"Sarajevo", "Skopje", "Warsaw", "Zagreb", "Brussels",
"Copenhagen", "Madrid", "Paris", "Amsterdam", "Berlin",
"Bern", "Rome", "Stockholm", "Vienna",
"West Central Africa" ],
[ 7_200, "Bucharest", "Cairo", "Helsinki", "Kyiv", "Riga", "Sofia",
"Tallinn", "Vilnius", "Athens", "Istanbul", "Minsk",
"Jerusalem", "Harare", "Pretoria" ],
[ 10_800, "Moscow", "St. Petersburg", "Volgograd", "Kuwait", "Riyadh",
"Nairobi", "Baghdad" ],
[ 12_600, "Tehran" ],
[ 14_400, "Abu Dhabi", "Muscat", "Baku", "Tbilisi", "Yerevan" ],
[ 16_200, "Kabul" ],
[ 18_000, "Ekaterinburg", "Islamabad", "Karachi", "Tashkent" ],
[ 19_800, "Chennai", "Kolkata", "Mumbai", "New Delhi", "Sri Jayawardenepura" ],
[ 20_700, "Kathmandu" ],
[ 21_600, "Astana", "Dhaka", "Almaty",
"Novosibirsk" ],
[ 23_400, "Rangoon" ],
[ 25_200, "Bangkok", "Hanoi", "Jakarta", "Krasnoyarsk" ],
[ 28_800, "Beijing", "Chongqing", "Hong Kong", "Urumqi",
"Kuala Lumpur", "Singapore", "Taipei", "Perth", "Irkutsk",
"Ulaan Bataar" ],
[ 32_400, "Seoul", "Osaka", "Sapporo", "Tokyo", "Yakutsk" ],
[ 34_200, "Darwin", "Adelaide" ],
[ 36_000, "Canberra", "Melbourne", "Sydney", "Brisbane", "Hobart",
"Vladivostok", "Guam", "Port Moresby" ],
[ 39_600, "Magadan", "Solomon Is.", "New Caledonia" ],
[ 43_200, "Fiji", "Kamchatka", "Marshall Is.", "Auckland",
"Wellington" ],
[ 46_800, "Nuku'alofa" ]].
each do |offset, *places|
places.sort.each do |place|
place.freeze
zone = new(place, offset)
ZONES << zone
ZONES_MAP[place] = zone
end
end
ZONES.freeze
ZONES_MAP.freeze
US_ZONES = ZONES.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ }
US_ZONES.freeze
end
class << self
alias_method :create, :new
# 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.)
def new(name)
self[name]
end
# 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.
def all
ZONES
end
# 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.
def [](arg)
case arg
when String
ZONES_MAP[arg]
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
# A convenience method for returning a collection of TimeZone objects
# for time zones in the USA.
def us_zones
US_ZONES
end
end
end
end