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 134 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'slocal
,parse
,at
andnow
methods.
If you set config.time_zone
in the Rails Application, you can access this TimeZone
object via Time.zone
:
# application.rb:
class Application < Rails::Application
config.time_zone = 'Eastern Time (US & Canada)'
end
Time.zone # => #<ActiveSupport::TimeZone:0x514834...>
Time.zone.name # => "Eastern Time (US & Canada)"
Time.zone.now # => Sun, 18 May 2008 14:30:44 EDT -04:00
- #
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- Comparable
Constants
MAPPING | = | { "International Date Line West" => "Etc/GMT+12", "Midway Island" => "Pacific/Midway", "American 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", "Montevideo" => "America/Montevideo", "Georgetown" => "America/Guyana", "Puerto Rico" => "America/Puerto_Rico", "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/Zurich", "Zurich" => "Europe/Zurich", "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", "Kaliningrad" => "Europe/Kaliningrad", "Moscow" => "Europe/Moscow", "St. Petersburg" => "Europe/Moscow", "Volgograd" => "Europe/Volgograd", "Samara" => "Europe/Samara", "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", "Ulaanbaatar" => "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", "Srednekolymsk" => "Asia/Srednekolymsk", "Solomon Is." => "Pacific/Guadalcanal", "New Caledonia" => "Pacific/Noumea", "Fiji" => "Pacific/Fiji", "Kamchatka" => "Asia/Kamchatka", "Marshall Is." => "Pacific/Majuro", "Auckland" => "Pacific/Auckland", "Wellington" => "Pacific/Auckland", "Nuku'alofa" => "Pacific/Tongatapu", "Tokelau Is." => "Pacific/Fakaofo", "Chatham Is." => "Pacific/Chatham", "Samoa" => "Pacific/Apia" } |
Keys are Rails |
Attributes
[R] | name | |
[R] | tzinfo |
Class Public methods
[](arg) Link
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 230 def [](arg) case arg when self arg when String begin @lazy_zones_map[arg] ||= create(arg) rescue TZInfo::InvalidTimezoneIdentifier nil end when TZInfo::Timezone @lazy_zones_map[arg.name] ||= create(arg.name, nil, 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
all() Link
country_zones(country_code) Link
A convenience method for returning a collection of TimeZone
objects for time zones in the country specified by its ISO 3166-1 Alpha2 code.
find_tzinfo(name) Link
new(name) Link
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.)
new(name, utc_offset = nil, tzinfo = nil) Link
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).
seconds_to_utc_offset(seconds, colon = true) Link
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 197 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
us_zones() Link
A convenience method for returning a collection of TimeZone
objects for time zones in the USA.
Instance Public methods
<=>(zone) Link
Compare this time zone to the parameter. The two are compared first on their offsets, and then by name.
=~(re) Link
Compare name
and TZInfo identifier to a supplied regexp, returning true
if a match is found.
at(*args) Link
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
A second argument can be supplied to specify sub-second precision.
Time.zone = 'Hawaii' # => "Hawaii"
Time.at(946684800, 123456.789).nsec # => 123456789
formatted_offset(colon = true, alternate_utc_string = nil) Link
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"
iso8601(str) Link
Method
for creating new ActiveSupport::TimeWithZone
instance in time zone of self
from an ISO 8601 string.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.iso8601('1999-12-31T14:00:00') # => Fri, 31 Dec 1999 14:00:00 HST -10:00
If the time components are missing then they will be set to zero.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.iso8601('1999-12-31') # => Fri, 31 Dec 1999 00:00:00 HST -10:00
If the string is invalid then an ArgumentError
will be raised unlike parse
which usually returns nil
when given an invalid date string.
# File activesupport/lib/active_support/values/time_zone.rb, line 387 def iso8601(str) # Historically `Date._iso8601(nil)` returns `{}`, but in the `date` gem versions `3.2.1`, `3.1.2`, `3.0.2`, # and `2.0.1`, `Date._iso8601(nil)` raises `TypeError` https://github.com/ruby/date/issues/39 # Future `date` releases are expected to revert back to the original behavior. raise ArgumentError, "invalid date" if str.nil? parts = Date._iso8601(str) year = parts.fetch(:year) if parts.key?(:yday) ordinal_date = Date.ordinal(year, parts.fetch(:yday)) month = ordinal_date.month day = ordinal_date.day else month = parts.fetch(:mon) day = parts.fetch(:mday) end time = Time.new( year, month, day, parts.fetch(:hour, 0), parts.fetch(:min, 0), parts.fetch(:sec, 0) + parts.fetch(:sec_fraction, 0), parts.fetch(:offset, 0) ) if parts[:offset] TimeWithZone.new(time.utc, self) else TimeWithZone.new(nil, self, time) end rescue Date::Error, KeyError raise ArgumentError, "invalid date" end
local(*args) Link
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
local_to_utc(time, dst = true) Link
Adjust the given time to the simultaneous time in UTC. Returns a Time.utc() instance.
match?(re) Link
Compare name
and TZInfo identifier to a supplied regexp, returning true
if a match is found.
now() Link
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
parse(str, now = now()) Link
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 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
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
If the string is invalid then an ArgumentError
could be raised.
period_for_local(time, dst = true) Link
Available so that TimeZone
instances respond like TZInfo::Timezone instances.
period_for_utc(time) Link
Available so that TimeZone
instances respond like TZInfo::Timezone instances.
rfc3339(str) Link
Method
for creating new ActiveSupport::TimeWithZone
instance in time zone of self
from an RFC 3339 string.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.rfc3339('2000-01-01T00:00:00Z') # => Fri, 31 Dec 1999 14:00:00 HST -10:00
If the time or zone components are missing then an ArgumentError
will be raised. This is much stricter than either parse
or iso8601
which allow for missing components.
Time.zone = 'Hawaii' # => "Hawaii"
Time.zone.rfc3339('1999-12-31') # => ArgumentError: invalid date
# File activesupport/lib/active_support/values/time_zone.rb, line 460 def rfc3339(str) parts = Date._rfc3339(str) raise ArgumentError, "invalid date" if parts.empty? time = Time.new( parts.fetch(:year), parts.fetch(:mon), parts.fetch(:mday), parts.fetch(:hour), parts.fetch(:min), parts.fetch(:sec) + parts.fetch(:sec_fraction, 0), parts.fetch(:offset) ) TimeWithZone.new(time.utc, self) end
strptime(str, format, now = now()) Link
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 TimeZone#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
to_s() Link
Returns a textual representation of this time zone.
today() Link
Returns the current date in this time zone.
tomorrow() Link
Returns the next date in this time zone.
utc_offset() Link
Returns the offset of this time zone from UTC in seconds.
utc_to_local(time) Link
Adjust the given time to the simultaneous time in the time zone represented by self
. Returns a local time with the appropriate offset – if you want an ActiveSupport::TimeWithZone
instance, use Time#in_time_zone()
instead.
As of tzinfo 2, utc_to_local
returns a Time
with a non-zero utc_offset. See the utc_to_local_returns_utc_offset_times
config for more info.
# File activesupport/lib/active_support/values/time_zone.rb, line 533 def utc_to_local(time) tzinfo.utc_to_local(time).yield_self do |t| ActiveSupport.utc_to_local_returns_utc_offset_times ? t : Time.utc(t.year, t.month, t.day, t.hour, t.min, t.sec, t.sec_fraction * 1_000_000) end end