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 Time.zone has not been set for the current request, returns the TimeZone specified in config.time_zone. def zone Thread.current[:time_zone] || zone_default end # Sets Time.zone 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)", -5.hours). # * 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 Time.zone on a per request basis -- current_user.time_zone # just needs to return a string identifying the user's preferred TimeZone: # # class ApplicationController < ActionController::Base # before_filter :set_time_zone # # def set_time_zone # Time.zone = current_user.time_zone # end # end def zone=(time_zone) Thread.current[:time_zone] = get_zone(time_zone) end # Allows override of Time.zone locally inside supplied block; resets Time.zone to existing value when done. def use_zone(time_zone) old_zone, ::Time.zone = ::Time.zone, get_zone(time_zone) yield ensure ::Time.zone = old_zone end private 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) rescue nil end # Return if a TimeZone instance, or wrap in a TimeZone instance if a TZInfo::Timezone if time_zone time_zone.is_a?(ActiveSupport::TimeZone) ? time_zone : ActiveSupport::TimeZone.create(time_zone.name, nil, time_zone) end end end # Returns the simultaneous time in Time.zone. # # 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 Time.zone 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 Time.zone. # # 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