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rails--rails/activesupport/lib/active_support/time_with_zone.rb
Andrew White 3aa26cfb19 Improve ActiveSupport::TimeWithZone conversion to YAML 
Previously when converting AS::TimeWithZone to YAML it would be output
as a UTC timestamp. Whilst this preserves the time information accurately
it loses the timezone information. This commit changes that so that it is
saved along with the time information. It also provides nicer encoding of
AS::TimeZone instances themselves which previously embedded all of the
data from the TZInfo records.

Fixes #9183.
2015-04-22 12:12:39 -04:00

450 lines
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Ruby
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require 'active_support/values/time_zone'
require 'active_support/core_ext/object/acts_like'
module ActiveSupport
# A Time-like class that can represent a time in any time zone. Necessary
# because standard Ruby Time instances are limited to UTC and the
# system's <tt>ENV['TZ']</tt> zone.
#
# You shouldn't ever need to create a TimeWithZone instance directly via +new+.
# Instead use methods +local+, +parse+, +at+ and +now+ on TimeZone instances,
# and +in_time_zone+ on Time and DateTime instances.
#
# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
# Time.zone.local(2007, 2, 10, 15, 30, 45) # => Sat, 10 Feb 2007 15:30:45 EST -05:00
# Time.zone.parse('2007-02-10 15:30:45') # => Sat, 10 Feb 2007 15:30:45 EST -05:00
# Time.zone.at(1170361845) # => Sat, 10 Feb 2007 15:30:45 EST -05:00
# Time.zone.now # => Sun, 18 May 2008 13:07:55 EDT -04:00
# Time.utc(2007, 2, 10, 20, 30, 45).in_time_zone # => Sat, 10 Feb 2007 15:30:45 EST -05:00
#
# See Time and TimeZone for further documentation of these methods.
#
# TimeWithZone instances implement the same API as Ruby Time instances, so
# that Time and TimeWithZone instances are interchangeable.
#
# t = Time.zone.now # => Sun, 18 May 2008 13:27:25 EDT -04:00
# t.hour # => 13
# t.dst? # => true
# t.utc_offset # => -14400
# t.zone # => "EDT"
# t.to_s(:rfc822) # => "Sun, 18 May 2008 13:27:25 -0400"
# t + 1.day # => Mon, 19 May 2008 13:27:25 EDT -04:00
# t.beginning_of_year # => Tue, 01 Jan 2008 00:00:00 EST -05:00
# t > Time.utc(1999) # => true
# t.is_a?(Time) # => true
# t.is_a?(ActiveSupport::TimeWithZone) # => true
class TimeWithZone
# Report class name as 'Time' to thwart type checking.
def self.name
'Time'
end
include Comparable
attr_reader :time_zone
def initialize(utc_time, time_zone, local_time = nil, period = nil)
@utc, @time_zone, @time = utc_time, time_zone, local_time
@period = @utc ? period : get_period_and_ensure_valid_local_time(period)
end
# Returns a Time or DateTime instance that represents the time in +time_zone+.
def time
@time ||= period.to_local(@utc)
end
# Returns a Time or DateTime instance that represents the time in UTC.
def utc
@utc ||= period.to_utc(@time)
end
alias_method :comparable_time, :utc
alias_method :getgm, :utc
alias_method :getutc, :utc
alias_method :gmtime, :utc
# Returns the underlying TZInfo::TimezonePeriod.
def period
@period ||= time_zone.period_for_utc(@utc)
end
# Returns the simultaneous time in <tt>Time.zone</tt>, or the specified zone.
def in_time_zone(new_zone = ::Time.zone)
return self if time_zone == new_zone
utc.in_time_zone(new_zone)
end
# Returns a <tt>Time.local()</tt> instance of the simultaneous time in your
# system's <tt>ENV['TZ']</tt> zone.
def localtime(utc_offset = nil)
utc.respond_to?(:getlocal) ? utc.getlocal(utc_offset) : utc.to_time.getlocal(utc_offset)
end
alias_method :getlocal, :localtime
# Returns true if the current time is within Daylight Savings Time for the
# specified time zone.
#
# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
# Time.zone.parse("2012-5-30").dst? # => true
# Time.zone.parse("2012-11-30").dst? # => false
def dst?
period.dst?
end
alias_method :isdst, :dst?
# Returns true if the current time zone is set to UTC.
#
# Time.zone = 'UTC' # => 'UTC'
# Time.zone.now.utc? # => true
# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
# Time.zone.now.utc? # => false
def utc?
time_zone.name == 'UTC'
end
alias_method :gmt?, :utc?
# Returns the offset from current time to UTC time in seconds.
def utc_offset
period.utc_total_offset
end
alias_method :gmt_offset, :utc_offset
alias_method :gmtoff, :utc_offset
# Returns a formatted string of the offset from UTC, or an alternative
# string if the time zone is already UTC.
#
# Time.zone = 'Eastern Time (US & Canada)' # => "Eastern Time (US & Canada)"
# Time.zone.now.formatted_offset(true) # => "-05:00"
# Time.zone.now.formatted_offset(false) # => "-0500"
# Time.zone = 'UTC' # => "UTC"
# Time.zone.now.formatted_offset(true, "0") # => "0"
def formatted_offset(colon = true, alternate_utc_string = nil)
utc? && alternate_utc_string || TimeZone.seconds_to_utc_offset(utc_offset, colon)
end
# Returns the time zone abbreviation.
#
# Time.zone = 'Eastern Time (US & Canada)' # => "Eastern Time (US & Canada)"
# Time.zone.now.zone # => "EST"
def zone
period.zone_identifier.to_s
end
# Returns a string of the object's date, time, zone and offset from UTC.
#
# Time.zone.now.httpdate # => "Thu, 04 Dec 2014 11:00:25 EST -05:00"
def inspect
"#{time.strftime('%a, %d %b %Y %H:%M:%S')} #{zone} #{formatted_offset}"
end
# Returns a string of the object's date and time in the ISO 8601 standard
# format.
#
# Time.zone.now.xmlschema # => "2014-12-04T11:02:37-05:00"
def xmlschema(fraction_digits = 0)
fraction = if fraction_digits.to_i > 0
(".%06i" % time.usec)[0, fraction_digits.to_i + 1]
end
"#{time.strftime("%Y-%m-%dT%H:%M:%S")}#{fraction}#{formatted_offset(true, 'Z')}"
end
alias_method :iso8601, :xmlschema
# Coerces time to a string for JSON encoding. The default format is ISO 8601.
# You can get %Y/%m/%d %H:%M:%S +offset style by setting
# <tt>ActiveSupport::JSON::Encoding.use_standard_json_time_format</tt>
# to +false+.
#
# # With ActiveSupport::JSON::Encoding.use_standard_json_time_format = true
# Time.utc(2005,2,1,15,15,10).in_time_zone("Hawaii").to_json
# # => "2005-02-01T05:15:10.000-10:00"
#
# # With ActiveSupport::JSON::Encoding.use_standard_json_time_format = false
# Time.utc(2005,2,1,15,15,10).in_time_zone("Hawaii").to_json
# # => "2005/02/01 05:15:10 -1000"
def as_json(options = nil)
if ActiveSupport::JSON::Encoding.use_standard_json_time_format
xmlschema(ActiveSupport::JSON::Encoding.time_precision)
else
%(#{time.strftime("%Y/%m/%d %H:%M:%S")} #{formatted_offset(false)})
end
end
def init_with(coder) #:nodoc:
initialize(coder['utc'], coder['zone'], coder['time'])
end
def encode_with(coder) #:nodoc:
coder.tag = '!ruby/object:ActiveSupport::TimeWithZone'
coder.map = { 'utc' => utc, 'zone' => time_zone, 'time' => time }
end
# Returns a string of the object's date and time in the format used by
# HTTP requests.
#
# Time.zone.now.httpdate # => "Tue, 01 Jan 2013 04:39:43 GMT"
def httpdate
utc.httpdate
end
# Returns a string of the object's date and time in the RFC 2822 standard
# format.
#
# Time.zone.now.rfc2822 # => "Tue, 01 Jan 2013 04:51:39 +0000"
def rfc2822
to_s(:rfc822)
end
alias_method :rfc822, :rfc2822
# Returns a string of the object's date and time.
# Accepts an optional <tt>format</tt>:
# * <tt>:default</tt> - default value, mimics Ruby Time#to_s format.
# * <tt>:db</tt> - format outputs time in UTC :db time. See Time#to_formatted_s(:db).
# * Any key in <tt>Time::DATE_FORMATS</tt> can be used. See active_support/core_ext/time/conversions.rb.
def to_s(format = :default)
if format == :db
utc.to_s(format)
elsif formatter = ::Time::DATE_FORMATS[format]
formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
else
"#{time.strftime("%Y-%m-%d %H:%M:%S")} #{formatted_offset(false, 'UTC')}" # mimicking Ruby Time#to_s format
end
end
alias_method :to_formatted_s, :to_s
# Replaces <tt>%Z</tt> directive with +zone before passing to Time#strftime,
# so that zone information is correct.
def strftime(format)
format = format.gsub(/((?:\A|[^%])(?:%%)*)%Z/, "\\1#{zone}")
getlocal(utc_offset).strftime(format)
end
# Use the time in UTC for comparisons.
def <=>(other)
utc <=> other
end
# Returns true if the current object's time is within the specified
# +min+ and +max+ time.
def between?(min, max)
utc.between?(min, max)
end
# Returns true if the current object's time is in the past.
def past?
utc.past?
end
# Returns true if the current object's time falls within
# the current day.
def today?
time.today?
end
# Returns true if the current object's time is in the future.
def future?
utc.future?
end
def eql?(other)
utc.eql?(other)
end
def hash
utc.hash
end
# Adds an interval of time to the current object's time and returns that
# value as a new TimeWithZone object.
#
# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
# now = Time.zone.now # => Sun, 02 Nov 2014 01:26:28 EDT -04:00
# now + 1000 # => Sun, 02 Nov 2014 01:43:08 EDT -04:00
#
# If we're adding a Duration of variable length (i.e., years, months, days),
# move forward from #time, otherwise move forward from #utc, for accuracy
# when moving across DST boundaries.
#
# For instance, a time + 24.hours will advance exactly 24 hours, while a
# time + 1.day will advance 23-25 hours, depending on the day.
#
# now + 24.hours # => Mon, 03 Nov 2014 00:26:28 EST -05:00
# now + 1.day # => Mon, 03 Nov 2014 01:26:28 EST -05:00
def +(other)
if duration_of_variable_length?(other)
method_missing(:+, other)
else
result = utc.acts_like?(:date) ? utc.since(other) : utc + other rescue utc.since(other)
result.in_time_zone(time_zone)
end
end
alias_method :since, :+
# Returns a new TimeWithZone object that represents the difference between
# the current object's time and the +other+ time.
#
# Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
# now = Time.zone.now # => Sun, 02 Nov 2014 01:26:28 EST -05:00
# now - 1000 # => Sun, 02 Nov 2014 01:09:48 EST -05:00
#
# If subtracting a Duration of variable length (i.e., years, months, days),
# move backward from #time, otherwise move backward from #utc, for accuracy
# when moving across DST boundaries.
#
# For instance, a time - 24.hours will go subtract exactly 24 hours, while a
# time - 1.day will subtract 23-25 hours, depending on the day.
#
# now - 24.hours # => Sat, 01 Nov 2014 02:26:28 EDT -04:00
# now - 1.day # => Sat, 01 Nov 2014 01:26:28 EDT -04:00
def -(other)
if other.acts_like?(:time)
to_time - other.to_time
elsif duration_of_variable_length?(other)
method_missing(:-, other)
else
result = utc.acts_like?(:date) ? utc.ago(other) : utc - other rescue utc.ago(other)
result.in_time_zone(time_zone)
end
end
def ago(other)
since(-other)
end
def advance(options)
# If we're advancing a value of variable length (i.e., years, weeks, months, days), advance from #time,
# otherwise advance from #utc, for accuracy when moving across DST boundaries
if options.values_at(:years, :weeks, :months, :days).any?
method_missing(:advance, options)
else
utc.advance(options).in_time_zone(time_zone)
end
end
%w(year mon month day mday wday yday hour min sec usec nsec to_date).each do |method_name|
class_eval <<-EOV, __FILE__, __LINE__ + 1
def #{method_name} # def month
time.#{method_name} # time.month
end # end
EOV
end
def to_a
[time.sec, time.min, time.hour, time.day, time.mon, time.year, time.wday, time.yday, dst?, zone]
end
# Returns the object's date and time as a floating point number of seconds
# since the Epoch (January 1, 1970 00:00 UTC).
#
# Time.zone.now.to_f # => 1417709320.285418
def to_f
utc.to_f
end
# Returns the object's date and time as an integer number of seconds
# since the Epoch (January 1, 1970 00:00 UTC).
#
# Time.zone.now.to_i # => 1417709320
def to_i
utc.to_i
end
alias_method :tv_sec, :to_i
# Returns the object's date and time as a rational number of seconds
# since the Epoch (January 1, 1970 00:00 UTC).
#
# Time.zone.now.to_r # => (708854548642709/500000)
def to_r
utc.to_r
end
# Return an instance of Time in the system timezone.
def to_time
utc.to_time
end
def to_datetime
utc.to_datetime.new_offset(Rational(utc_offset, 86_400))
end
# So that +self+ <tt>acts_like?(:time)</tt>.
def acts_like_time?
true
end
# Say we're a Time to thwart type checking.
def is_a?(klass)
klass == ::Time || super
end
alias_method :kind_of?, :is_a?
def freeze
period; utc; time # preload instance variables before freezing
super
end
def marshal_dump
[utc, time_zone.name, time]
end
def marshal_load(variables)
initialize(variables[0].utc, ::Time.find_zone(variables[1]), variables[2].utc)
end
# respond_to_missing? is not called in some cases, such as when type conversion is
# performed with Kernel#String
def respond_to?(sym, include_priv = false)
# ensure that we're not going to throw and rescue from NoMethodError in method_missing which is slow
return false if sym.to_sym == :to_str
super
end
# Ensure proxy class responds to all methods that underlying time instance
# responds to.
def respond_to_missing?(sym, include_priv)
# consistently respond false to acts_like?(:date), regardless of whether #time is a Time or DateTime
return false if sym.to_sym == :acts_like_date?
time.respond_to?(sym, include_priv)
end
# Send the missing method to +time+ instance, and wrap result in a new
# TimeWithZone with the existing +time_zone+.
def method_missing(sym, *args, &block)
wrap_with_time_zone time.__send__(sym, *args, &block)
rescue NoMethodError => e
raise e, e.message.sub(time.inspect, self.inspect), e.backtrace
end
private
def get_period_and_ensure_valid_local_time(period)
# we don't want a Time.local instance enforcing its own DST rules as well,
# so transfer time values to a utc constructor if necessary
@time = transfer_time_values_to_utc_constructor(@time) unless @time.utc?
begin
period || @time_zone.period_for_local(@time)
rescue ::TZInfo::PeriodNotFound
# time is in the "spring forward" hour gap, so we're moving the time forward one hour and trying again
@time += 1.hour
retry
end
end
def transfer_time_values_to_utc_constructor(time)
::Time.utc(time.year, time.month, time.day, time.hour, time.min, time.sec, Rational(time.nsec, 1000))
end
def duration_of_variable_length?(obj)
ActiveSupport::Duration === obj && obj.parts.any? {|p| [:years, :months, :days].include?(p[0]) }
end
def wrap_with_time_zone(time)
if time.acts_like?(:time)
periods = time_zone.periods_for_local(time)
self.class.new(nil, time_zone, time, periods.include?(period) ? period : nil)
elsif time.is_a?(Range)
wrap_with_time_zone(time.begin)..wrap_with_time_zone(time.end)
else
time
end
end
end
end
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