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17f5d8e062
Add `DateTime#usec` and `DateTime#nsec` so that `ActiveSupport::TimeWithZone` keeps sub-second resolution when wrapping a `DateTime` value. Fixes #10855
401 lines
14 KiB
Ruby
401 lines
14 KiB
Ruby
require 'active_support/values/time_zone'
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require 'active_support/core_ext/object/acts_like'
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module ActiveSupport
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# A Time-like class that can represent a time in any time zone. Necessary
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# because standard Ruby Time instances are limited to UTC and the
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# system's <tt>ENV['TZ']</tt> zone.
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#
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# You shouldn't ever need to create a TimeWithZone instance directly via +new+.
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# Instead use methods +local+, +parse+, +at+ and +now+ on TimeZone instances,
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# and +in_time_zone+ on Time and DateTime instances.
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#
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# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
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# Time.zone.local(2007, 2, 10, 15, 30, 45) # => Sat, 10 Feb 2007 15:30:45 EST -05:00
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# Time.zone.parse('2007-02-10 15:30:45') # => Sat, 10 Feb 2007 15:30:45 EST -05:00
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# Time.zone.at(1170361845) # => Sat, 10 Feb 2007 15:30:45 EST -05:00
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# Time.zone.now # => Sun, 18 May 2008 13:07:55 EDT -04:00
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# Time.utc(2007, 2, 10, 20, 30, 45).in_time_zone # => Sat, 10 Feb 2007 15:30:45 EST -05:00
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#
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# See Time and TimeZone for further documentation of these methods.
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#
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# TimeWithZone instances implement the same API as Ruby Time instances, so
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# that Time and TimeWithZone instances are interchangeable.
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#
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# t = Time.zone.now # => Sun, 18 May 2008 13:27:25 EDT -04:00
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# t.hour # => 13
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# t.dst? # => true
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# t.utc_offset # => -14400
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# t.zone # => "EDT"
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# t.to_s(:rfc822) # => "Sun, 18 May 2008 13:27:25 -0400"
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# t + 1.day # => Mon, 19 May 2008 13:27:25 EDT -04:00
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# t.beginning_of_year # => Tue, 01 Jan 2008 00:00:00 EST -05:00
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# t > Time.utc(1999) # => true
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# t.is_a?(Time) # => true
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# t.is_a?(ActiveSupport::TimeWithZone) # => true
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class TimeWithZone
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# Report class name as 'Time' to thwart type checking.
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def self.name
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'Time'
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end
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include Comparable
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attr_reader :time_zone
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def initialize(utc_time, time_zone, local_time = nil, period = nil)
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@utc, @time_zone, @time = utc_time, time_zone, local_time
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@period = @utc ? period : get_period_and_ensure_valid_local_time
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end
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# Returns a Time or DateTime instance that represents the time in +time_zone+.
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def time
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@time ||= period.to_local(@utc)
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end
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# Returns a Time or DateTime instance that represents the time in UTC.
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def utc
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@utc ||= period.to_utc(@time)
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end
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alias_method :comparable_time, :utc
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alias_method :getgm, :utc
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alias_method :getutc, :utc
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alias_method :gmtime, :utc
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# Returns the underlying TZInfo::TimezonePeriod.
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def period
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@period ||= time_zone.period_for_utc(@utc)
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end
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# Returns the simultaneous time in <tt>Time.zone</tt>, or the specified zone.
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def in_time_zone(new_zone = ::Time.zone)
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return self if time_zone == new_zone
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utc.in_time_zone(new_zone)
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end
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# Returns a <tt>Time.local()</tt> instance of the simultaneous time in your
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# system's <tt>ENV['TZ']</tt> zone.
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def localtime
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utc.respond_to?(:getlocal) ? utc.getlocal : utc.to_time.getlocal
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end
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alias_method :getlocal, :localtime
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# Returns true if the current time is within Daylight Savings Time for the
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# specified time zone.
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#
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# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
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# Time.zone.parse("2012-5-30").dst? # => true
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# Time.zone.parse("2012-11-30").dst? # => false
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def dst?
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period.dst?
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end
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alias_method :isdst, :dst?
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# Returns true if the current time zone is set to UTC.
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#
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# Time.zone = 'UTC' # => 'UTC'
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# Time.zone.now.utc? # => true
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# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
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# Time.zone.now.utc? # => false
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def utc?
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time_zone.name == 'UTC'
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end
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alias_method :gmt?, :utc?
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# Returns the offset from current time to UTC time in seconds.
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def utc_offset
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period.utc_total_offset
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end
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alias_method :gmt_offset, :utc_offset
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alias_method :gmtoff, :utc_offset
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# Returns a formatted string of the offset from UTC, or an alternative
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# string if the time zone is already UTC.
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#
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# Time.zone = 'Eastern Time (US & Canada)' # => "Eastern Time (US & Canada)"
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# Time.zone.now.formatted_offset(true) # => "-05:00"
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# Time.zone.now.formatted_offset(false) # => "-0500"
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# Time.zone = 'UTC' # => "UTC"
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# Time.zone.now.formatted_offset(true, "0") # => "0"
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def formatted_offset(colon = true, alternate_utc_string = nil)
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utc? && alternate_utc_string || TimeZone.seconds_to_utc_offset(utc_offset, colon)
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end
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# Time uses +zone+ to display the time zone abbreviation, so we're
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# duck-typing it.
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def zone
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period.zone_identifier.to_s
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end
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def inspect
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"#{time.strftime('%a, %d %b %Y %H:%M:%S')} #{zone} #{formatted_offset}"
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end
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def xmlschema(fraction_digits = 0)
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fraction = if fraction_digits > 0
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(".%06i" % time.usec)[0, fraction_digits + 1]
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end
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"#{time.strftime("%Y-%m-%dT%H:%M:%S")}#{fraction}#{formatted_offset(true, 'Z')}"
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end
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alias_method :iso8601, :xmlschema
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# Coerces time to a string for JSON encoding. The default format is ISO 8601.
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# You can get %Y/%m/%d %H:%M:%S +offset style by setting
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# <tt>ActiveSupport::JSON::Encoding.use_standard_json_time_format</tt>
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# to +false+.
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#
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# # With ActiveSupport::JSON::Encoding.use_standard_json_time_format = true
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# Time.utc(2005,2,1,15,15,10).in_time_zone.to_json
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# # => "2005-02-01T15:15:10Z"
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#
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# # With ActiveSupport::JSON::Encoding.use_standard_json_time_format = false
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# Time.utc(2005,2,1,15,15,10).in_time_zone.to_json
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# # => "2005/02/01 15:15:10 +0000"
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def as_json(options = nil)
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if ActiveSupport::JSON::Encoding.use_standard_json_time_format
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xmlschema(3)
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else
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%(#{time.strftime("%Y/%m/%d %H:%M:%S")} #{formatted_offset(false)})
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end
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end
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def encode_with(coder)
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if coder.respond_to?(:represent_object)
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coder.represent_object(nil, utc)
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else
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coder.represent_scalar(nil, utc.strftime("%Y-%m-%d %H:%M:%S.%9NZ"))
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end
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end
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# Returns a string of the object's date and time in the format used by
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# HTTP requests.
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#
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# Time.zone.now.httpdate # => "Tue, 01 Jan 2013 04:39:43 GMT"
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def httpdate
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utc.httpdate
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end
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# Returns a string of the object's date and time in the RFC 2822 standard
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# format.
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#
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# Time.zone.now.rfc2822 # => "Tue, 01 Jan 2013 04:51:39 +0000"
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def rfc2822
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to_s(:rfc822)
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end
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alias_method :rfc822, :rfc2822
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# <tt>:db</tt> format outputs time in UTC; all others output time in local.
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# Uses TimeWithZone's +strftime+, so <tt>%Z</tt> and <tt>%z</tt> work correctly.
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def to_s(format = :default)
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if format == :db
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utc.to_s(format)
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elsif formatter = ::Time::DATE_FORMATS[format]
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formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
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else
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"#{time.strftime("%Y-%m-%d %H:%M:%S")} #{formatted_offset(false, 'UTC')}" # mimicking Ruby 1.9 Time#to_s format
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end
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end
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alias_method :to_formatted_s, :to_s
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# Replaces <tt>%Z</tt> and <tt>%z</tt> directives with +zone+ and
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# +formatted_offset+, respectively, before passing to Time#strftime, so
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# that zone information is correct
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def strftime(format)
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format = format.gsub('%Z', zone)
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.gsub('%z', formatted_offset(false))
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.gsub('%:z', formatted_offset(true))
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.gsub('%::z', formatted_offset(true) + ":00")
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time.strftime(format)
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end
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# Use the time in UTC for comparisons.
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def <=>(other)
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utc <=> other
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end
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# Returns true if the current object's time is within the specified
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# +min+ and +max+ time.
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def between?(min, max)
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utc.between?(min, max)
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end
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# Returns true if the current object's time is in the past.
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def past?
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utc.past?
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end
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# Returns true if the current object's time falls within
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# the current day.
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def today?
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time.today?
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end
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# Returns true if the current object's time is in the future.
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def future?
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utc.future?
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end
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def eql?(other)
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utc.eql?(other)
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end
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def hash
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utc.hash
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end
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def +(other)
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# If we're adding a Duration of variable length (i.e., years, months, days), move forward from #time,
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# otherwise move forward from #utc, for accuracy when moving across DST boundaries
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if duration_of_variable_length?(other)
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method_missing(:+, other)
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else
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result = utc.acts_like?(:date) ? utc.since(other) : utc + other rescue utc.since(other)
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result.in_time_zone(time_zone)
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end
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end
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def -(other)
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# If we're subtracting a Duration of variable length (i.e., years, months, days), move backwards from #time,
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# otherwise move backwards #utc, for accuracy when moving across DST boundaries
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if other.acts_like?(:time)
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utc.to_f - other.to_f
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elsif duration_of_variable_length?(other)
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method_missing(:-, other)
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else
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result = utc.acts_like?(:date) ? utc.ago(other) : utc - other rescue utc.ago(other)
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result.in_time_zone(time_zone)
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end
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end
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def since(other)
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# If we're adding a Duration of variable length (i.e., years, months, days), move forward from #time,
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# otherwise move forward from #utc, for accuracy when moving across DST boundaries
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if duration_of_variable_length?(other)
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method_missing(:since, other)
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else
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utc.since(other).in_time_zone(time_zone)
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end
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end
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def ago(other)
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since(-other)
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end
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def advance(options)
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# If we're advancing a value of variable length (i.e., years, weeks, months, days), advance from #time,
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# otherwise advance from #utc, for accuracy when moving across DST boundaries
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if options.values_at(:years, :weeks, :months, :days).any?
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method_missing(:advance, options)
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else
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utc.advance(options).in_time_zone(time_zone)
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end
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end
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%w(year mon month day mday wday yday hour min sec usec nsec to_date).each do |method_name|
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class_eval <<-EOV, __FILE__, __LINE__ + 1
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def #{method_name} # def month
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time.#{method_name} # time.month
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end # end
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EOV
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end
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def to_a
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[time.sec, time.min, time.hour, time.day, time.mon, time.year, time.wday, time.yday, dst?, zone]
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end
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def to_f
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utc.to_f
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end
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def to_i
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utc.to_i
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end
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alias_method :tv_sec, :to_i
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def to_r
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utc.to_r
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end
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# Return an instance of Time in the system timezone.
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def to_time
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utc.to_time
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end
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def to_datetime
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utc.to_datetime.new_offset(Rational(utc_offset, 86_400))
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end
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# So that +self+ <tt>acts_like?(:time)</tt>.
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def acts_like_time?
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true
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end
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# Say we're a Time to thwart type checking.
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def is_a?(klass)
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klass == ::Time || super
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end
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alias_method :kind_of?, :is_a?
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def freeze
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period; utc; time # preload instance variables before freezing
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super
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end
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def marshal_dump
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[utc, time_zone.name, time]
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end
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def marshal_load(variables)
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initialize(variables[0].utc, ::Time.find_zone(variables[1]), variables[2].utc)
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end
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# Ensure proxy class responds to all methods that underlying time instance
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# responds to.
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def respond_to_missing?(sym, include_priv)
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# consistently respond false to acts_like?(:date), regardless of whether #time is a Time or DateTime
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return false if sym.to_sym == :acts_like_date?
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time.respond_to?(sym, include_priv)
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end
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# Send the missing method to +time+ instance, and wrap result in a new
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# TimeWithZone with the existing +time_zone+.
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def method_missing(sym, *args, &block)
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wrap_with_time_zone time.__send__(sym, *args, &block)
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rescue NoMethodError => e
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raise e, e.message.sub(time.inspect, self.inspect), e.backtrace
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end
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private
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def get_period_and_ensure_valid_local_time
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# we don't want a Time.local instance enforcing its own DST rules as well,
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# so transfer time values to a utc constructor if necessary
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@time = transfer_time_values_to_utc_constructor(@time) unless @time.utc?
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begin
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@time_zone.period_for_local(@time)
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rescue ::TZInfo::PeriodNotFound
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# time is in the "spring forward" hour gap, so we're moving the time forward one hour and trying again
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@time += 1.hour
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retry
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end
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end
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def transfer_time_values_to_utc_constructor(time)
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::Time.utc(time.year, time.month, time.day, time.hour, time.min, time.sec, Rational(time.nsec, 1000))
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end
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def duration_of_variable_length?(obj)
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ActiveSupport::Duration === obj && obj.parts.any? {|p| [:years, :months, :days].include?(p[0]) }
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end
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def wrap_with_time_zone(time)
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if time.acts_like?(:time)
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self.class.new(nil, time_zone, time)
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elsif time.is_a?(Range)
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wrap_with_time_zone(time.begin)..wrap_with_time_zone(time.end)
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else
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time
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end
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end
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end
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end
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