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.
# File lib/active_support/values/time_zone.rb, line 387 def [](arg) case arg when String if tz = zones_map[arg] tz elsif tz = lookup(arg) zones_map[arg] = tz 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
TODO: Preload instead of lazy load for thread safety
# File lib/active_support/values/time_zone.rb, line 297 def self.find_tzinfo(name) require 'tzinfo' unless defined?(TZInfo) ::TZInfo::Timezone.get(MAPPING[name] || name) rescue TZInfo::InvalidTimezoneIdentifier nil end
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).
# File lib/active_support/values/time_zone.rb, line 181 def initialize(name, utc_offset = nil, tzinfo = nil) @name = name @utc_offset = utc_offset @tzinfo = tzinfo || TimeZone.find_tzinfo(name) @current_period = nil end
A convenience method for returning a collection of TimeZone objects for time zones in the USA.
# File lib/active_support/values/time_zone.rb, line 405 def us_zones @us_zones ||= all.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ } end
# File lib/active_support/values/time_zone.rb, line 321 def zones_map unless defined?(@zones_map) @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", "Kyev", "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.each do |place| @zones_map[place] = create(place, offset) end end end @zones_map end
Compare this time zone to the parameter. The two are comapred first on their offsets, and then by name.
# File lib/active_support/values/time_zone.rb, line 205 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.
# File lib/active_support/values/time_zone.rb, line 213 def =~(re) return true if name =~ re || MAPPING[name] =~ re 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
# File lib/active_support/values/time_zone.rb, line 236 def at(secs) utc = Time.at(secs).utc rescue DateTime.civil(1970).since(secs) utc.in_time_zone(self) end
Returns the offset of this time zone as a formatted string, of the format "+HH:MM".
# File lib/active_support/values/time_zone.rb, line 199 def formatted_offset(colon=true, alternate_utc_string = nil) utc_offset == 0 && alternate_utc_string || utc_offset.to_utc_offset_s(colon) 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
# File lib/active_support/values/time_zone.rb, line 226 def local(*args) time = Time.utc_time(*args) ActiveSupport::TimeWithZone.new(nil, self, time) end
Adjust the given time to the simultaneous time in UTC. Returns a Time.utc() instance.
# File lib/active_support/values/time_zone.rb, line 282 def local_to_utc(time, dst=true) tzinfo.local_to_utc(time, dst) 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
# File lib/active_support/values/time_zone.rb, line 266 def now Time.now.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
# File lib/active_support/values/time_zone.rb, line 250 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
Available so that TimeZone instances respond like TZInfo::Timezone instances
# File lib/active_support/values/time_zone.rb, line 292 def period_for_local(time, dst=true) tzinfo.period_for_local(time, dst) end
Available so that TimeZone instances respond like TZInfo::Timezone instances
# File lib/active_support/values/time_zone.rb, line 287 def period_for_utc(time) tzinfo.period_for_utc(time) end
Returns a textual representation of this time zone.
# File lib/active_support/values/time_zone.rb, line 218 def to_s "(GMT#{formatted_offset}) #{name}" end
Return the current date in this time zone.
# File lib/active_support/values/time_zone.rb, line 271 def today tzinfo.now.to_date end
# File lib/active_support/values/time_zone.rb, line 188 def utc_offset if @utc_offset @utc_offset else @current_period ||= tzinfo.current_period @current_period.utc_offset end 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.
# File lib/active_support/values/time_zone.rb, line 277 def utc_to_local(time) tzinfo.utc_to_local(time) end
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