Keys are Rails TimeZone names, values are TZInfo identifiers
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 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
TODO: Preload instead of lazy load for thread safety
# File 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
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 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
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"
# File 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
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 368 def us_zones @us_zones ||= all.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ } end
Compare this time zone to the parameter. The two are compared first on their offsets, and then by name.
# File 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
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 235 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 258 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 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
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 248 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 304 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 288 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 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
Available so that TimeZone instances respond like TZInfo::Timezone instances
# File lib/active_support/values/time_zone.rb, line 314 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 309 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 240 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 293 def today tzinfo.now.to_date end
# File 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
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 299 def utc_to_local(time) tzinfo.utc_to_local(time) end
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