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require 'active_support/time_with_zone'
class Time
class << self
attr_accessor :zone_default
# Returns the TimeZone for the current request, if this has been set (via Time.zone=).
# If <tt>Time.zone</tt> has not been set for the current request, returns the TimeZone specified in <tt>config.time_zone</tt>.
def zone
Thread.current[:time_zone] || zone_default
end
# Sets <tt>Time.zone</tt> to a TimeZone object for the current request/thread.
#
# This method accepts any of the following:
#
# * A Rails TimeZone object.
# * An identifier for a Rails TimeZone object (e.g., "Eastern Time (US & Canada)", <tt>-5.hours</tt>).
# * A TZInfo::Timezone object.
# * An identifier for a TZInfo::Timezone object (e.g., "America/New_York").
#
# Here's an example of how you might set <tt>Time.zone</tt> on a per request basis and reset it when the request is done.
# <tt>current_user.time_zone</tt> just needs to return a string identifying the user's preferred time zone:
#
# class ApplicationController < ActionController::Base
# around_filter :set_time_zone
#
# def set_time_zone
# old_time_zone = Time.zone
# Time.zone = current_user.time_zone if logged_in?
# yield
# ensure
# Time.zone = old_time_zone
# end
# end
def zone=(time_zone)
Thread.current[:time_zone] = get_zone(time_zone)
end
# Allows override of <tt>Time.zone</tt> locally inside supplied block; resets <tt>Time.zone</tt> to existing value when done.
def use_zone(time_zone)
new_zone = get_zone(time_zone)
begin
old_zone, ::Time.zone = ::Time.zone, new_zone
yield
ensure
::Time.zone = old_zone
end
end
private
# Returns a TimeZone instance or nil, or raises an ArgumentError for invalid timezones.
def get_zone(time_zone)
return time_zone if time_zone.nil? || time_zone.is_a?(ActiveSupport::TimeZone)
# lookup timezone based on identifier (unless we've been passed a TZInfo::Timezone)
unless time_zone.respond_to?(:period_for_local)
time_zone = ActiveSupport::TimeZone[time_zone] || TZInfo::Timezone.get(time_zone)
end
# Return if a TimeZone instance, or wrap in a TimeZone instance if a TZInfo::Timezone
time_zone.is_a?(ActiveSupport::TimeZone) ? time_zone : ActiveSupport::TimeZone.create(time_zone.name, nil, time_zone)
rescue TZInfo::InvalidTimezoneIdentifier
raise ArgumentError, "Invalid Timezone: #{time_zone}"
end
end
# Returns the simultaneous time in <tt>Time.zone</tt>.
#
# Time.zone = 'Hawaii' # => 'Hawaii'
# Time.utc(2000).in_time_zone # => Fri, 31 Dec 1999 14:00:00 HST -10:00
#
# This method is similar to Time#localtime, except that it uses <tt>Time.zone</tt> as the local zone
# instead of the operating system's time zone.
#
# You can also pass in a TimeZone instance or string that identifies a TimeZone as an argument,
# and the conversion will be based on that zone instead of <tt>Time.zone</tt>.
#
# Time.utc(2000).in_time_zone('Alaska') # => Fri, 31 Dec 1999 15:00:00 AKST -09:00
def in_time_zone(zone = ::Time.zone)
return self unless zone
ActiveSupport::TimeWithZone.new(utc? ? self : getutc, ::Time.__send__(:get_zone, zone))
end
end
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