class ActiveSupport::TimeZone

# File activesupport/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

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 activesupport/lib/active_support/values/time_zone.rb, line 218
def all
  @zones ||= zones_map.values.sort
end

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.

# File activesupport/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

A convenience method for returning a collection of TimeZone objects for time zones in the country specified by its ISO 3166-1 Alpha2 code.

# File activesupport/lib/active_support/values/time_zone.rb, line 211
def new(name)
  self[name]
end

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.)

# File activesupport/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

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 activesupport/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

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"

# File activesupport/lib/active_support/values/time_zone.rb, line 245
def us_zones
  country_zones(:us)
end

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

# File activesupport/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

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

# File activesupport/lib/active_support/values/time_zone.rb, line 323
def =~(re)
  re === name || re === MAPPING[name]
end

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

# File activesupport/lib/active_support/values/time_zone.rb, line 348
def at(secs)
  Time.at(secs).utc.in_time_zone(self)
end

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

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 activesupport/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

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"

# File activesupport/lib/active_support/values/time_zone.rb, line 337
def local(*args)
  time = Time.utc(*args)
  ActiveSupport::TimeWithZone.new(nil, self, time)
end

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

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

# File activesupport/lib/active_support/values/time_zone.rb, line 429
def local_to_utc(time, dst=true)
  tzinfo.local_to_utc(time, dst)
end

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

# File activesupport/lib/active_support/values/time_zone.rb, line 401
def now
  time_now.utc.in_time_zone(self)
end

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

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

# File activesupport/lib/active_support/values/time_zone.rb, line 368
def parse(str, now=now())
  parts_to_time(Date._parse(str, false), now)
end

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 #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

# File activesupport/lib/active_support/values/time_zone.rb, line 441
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 activesupport/lib/active_support/values/time_zone.rb, line 435
def period_for_utc(time)
  tzinfo.period_for_utc(time)
end

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

# File activesupport/lib/active_support/values/time_zone.rb, line 392
def strptime(str, format, now=now())
  parts_to_time(DateTime._strptime(str, format), now)
end

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 #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

# File activesupport/lib/active_support/values/time_zone.rb, line 328
def to_s
  "(GMT#{formatted_offset}) #{name}"
end

Returns a textual representation of this time zone.

# File activesupport/lib/active_support/values/time_zone.rb, line 406
def today
  tzinfo.now.to_date
end

Returns the current date in this time zone.

# File activesupport/lib/active_support/values/time_zone.rb, line 411
def tomorrow
  today + 1
end

Returns the next date in this time zone.

# File activesupport/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

Returns the offset of this time zone from UTC in seconds.

# File activesupport/lib/active_support/values/time_zone.rb, line 423
def utc_to_local(time)
  tzinfo.utc_to_local(time)
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 DateAndTime::Zones#in_time_zone instead.

# File activesupport/lib/active_support/values/time_zone.rb, line 416
def yesterday
  today - 1
end

Returns the previous date in this time zone.