Class: ActiveSupport::TimeWithZone

Inherits:
Object
  • Object
show all
Includes:
Comparable, DateAndTime::Compatibility
Defined in:
lib/active_support/time_with_zone.rb

Overview

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 ENV['TZ'] 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(1171139445)                        # => 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

Constant Summary collapse

PRECISIONS = 
Hash.new { |h, n| h[n] = "%FT%T.%#{n}N".freeze }

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(utc_time, time_zone, local_time = nil, period = nil) ⇒ TimeWithZone

Returns a new instance of TimeWithZone.



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# File 'lib/active_support/time_with_zone.rb', line 51

def initialize(utc_time, time_zone, local_time = nil, period = nil)
  @utc = utc_time ? transfer_time_values_to_utc_constructor(utc_time) : nil
  @time_zone, @time = time_zone, local_time
  @period = @utc ? period : get_period_and_ensure_valid_local_time(period)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object

Send the missing method to time instance, and wrap result in a new TimeWithZone with the existing time_zone.



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# File 'lib/active_support/time_with_zone.rb', line 472

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

Instance Attribute Details

#time_zone ⇒ Object (readonly)

Returns the value of attribute time_zone.



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# File 'lib/active_support/time_with_zone.rb', line 49

def time_zone
  @time_zone
end

Class Method Details

.name ⇒ Object

Report class name as ‘Time’ to thwart type checking.



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# File 'lib/active_support/time_with_zone.rb', line 41

def self.name
  'Time'
end

Instance Method Details

#+(other) ⇒ Object Also known as: since, in

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



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# File 'lib/active_support/time_with_zone.rb', line 274

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

#-(other) ⇒ Object

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 # => Mon, 03 Nov 2014 00:26:28 EST -05:00
now - 1000          # => Mon, 03 Nov 2014 00:09:48 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      # => Sun, 02 Nov 2014 01:26:28 EDT -04:00
now - 1.day         # => Sun, 02 Nov 2014 00:26:28 EDT -04:00



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# File 'lib/active_support/time_with_zone.rb', line 301

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

#<=>(other) ⇒ Object

Use the time in UTC for comparisons.



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# File 'lib/active_support/time_with_zone.rb', line 223

def <=>(other)
  utc <=> other
end

#acts_like_time? ⇒ Boolean

So that self acts_like?(:time).

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 426

def acts_like_time?
  true
end

#advance(options) ⇒ Object

Uses Date to provide precise Time calculations for years, months, and days according to the proleptic Gregorian calendar. The result is returned as a new TimeWithZone object.

The options parameter takes a hash with any of these keys: :years, :months, :weeks, :days, :hours, :minutes, :seconds.

If advancing by a value of variable length (i.e., years, weeks, months, days), move forward from #time, otherwise move forward from #utc, for accuracy when moving across DST boundaries.

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.advance(seconds: 1) # => Sun, 02 Nov 2014 01:26:29 EDT -04:00
now.advance(minutes: 1) # => Sun, 02 Nov 2014 01:27:28 EDT -04:00
now.advance(hours: 1)   # => Sun, 02 Nov 2014 01:26:28 EST -05:00
now.advance(days: 1)    # => Mon, 03 Nov 2014 01:26:28 EST -05:00
now.advance(weeks: 1)   # => Sun, 09 Nov 2014 01:26:28 EST -05:00
now.advance(months: 1)  # => Tue, 02 Dec 2014 01:26:28 EST -05:00
now.advance(years: 1)   # => Mon, 02 Nov 2015 01:26:28 EST -05:00



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# File 'lib/active_support/time_with_zone.rb', line 354

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

#ago(other) ⇒ Object

Subtracts an interval of time from the current object’s time and returns the result as a new TimeWithZone object.

Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
now = Time.zone.now # => Mon, 03 Nov 2014 00:26:28 EST -05:00
now.ago(1000)       # => Mon, 03 Nov 2014 00:09:48 EST -05:00

If we’re 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, time.ago(24.hours) will move back exactly 24 hours, while time.ago(1.day) will move back 23-25 hours, depending on the day.

now.ago(24.hours)   # => Sun, 02 Nov 2014 01:26:28 EDT -04:00
now.ago(1.day)      # => Sun, 02 Nov 2014 00:26:28 EDT -04:00



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# File 'lib/active_support/time_with_zone.rb', line 329

def ago(other)
  since(-other)
end

#as_json(options = nil) ⇒ Object

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 ActiveSupport::JSON::Encoding.use_standard_json_time_format 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"



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# File 'lib/active_support/time_with_zone.rb', line 165

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

#between?(min, max) ⇒ Boolean

Returns true if the current object’s time is within the specified min and max time.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 229

def between?(min, max)
  utc.between?(min, max)
end

#blank? ⇒ Boolean

An instance of ActiveSupport::TimeWithZone is never blank

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 437

def blank?
  false
end

#dst? ⇒ Boolean Also known as: isdst

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

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 94

def dst?
  period.dst?
end

#encode_with(coder) ⇒ Object

:nodoc:



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# File 'lib/active_support/time_with_zone.rb', line 177

def encode_with(coder) #:nodoc:
  coder.tag = '!ruby/object:ActiveSupport::TimeWithZone'
  coder.map = { 'utc' => utc, 'zone' => time_zone, 'time' => time }
end

#eql?(other) ⇒ Boolean

Returns true if other is equal to current object.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 250

def eql?(other)
  other.eql?(utc)
end

#formatted_offset(colon = true, alternate_utc_string = nil) ⇒ Object

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"



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# File 'lib/active_support/time_with_zone.rb', line 125

def formatted_offset(colon = true, alternate_utc_string = nil)
  utc? && alternate_utc_string || TimeZone.seconds_to_utc_offset(utc_offset, colon)
end

#freeze ⇒ Object 



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# File 'lib/active_support/time_with_zone.rb', line 441

def freeze
  # preload instance variables before freezing
  period; utc; time; to_datetime; to_time
  super
end

#future? ⇒ Boolean

Returns true if the current object’s time is in the future.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 245

def future?
  utc.future?
end

#hash ⇒ Object 



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# File 'lib/active_support/time_with_zone.rb', line 254

def hash
  utc.hash
end

#httpdate ⇒ Object

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"



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# File 'lib/active_support/time_with_zone.rb', line 186

def httpdate
  utc.httpdate
end

#in_time_zone(new_zone = ::Time.zone) ⇒ Object

Returns the simultaneous time in Time.zone, or the specified zone.



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# File 'lib/active_support/time_with_zone.rb', line 77

def in_time_zone(new_zone = ::Time.zone)
  return self if time_zone == new_zone
  utc.in_time_zone(new_zone)
end

#init_with(coder) ⇒ Object

:nodoc:



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# File 'lib/active_support/time_with_zone.rb', line 173

def init_with(coder) #:nodoc:
  initialize(coder['utc'], coder['zone'], coder['time'])
end

#inspect ⇒ Object

Returns a string of the object’s date, time, zone and offset from UTC.

Time.zone.now.inspect # => "Thu, 04 Dec 2014 11:00:25 EST -05:00"



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# File 'lib/active_support/time_with_zone.rb', line 140

def inspect
  "#{time.strftime('%a, %d %b %Y %H:%M:%S')} #{zone} #{formatted_offset}"
end

#is_a?(klass) ⇒ Boolean Also known as: kind_of?

Say we’re a Time to thwart type checking.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 431

def is_a?(klass)
  klass == ::Time || super
end

#localtime(utc_offset = nil) ⇒ Object Also known as: getlocal

Returns a Time instance of the simultaneous time in the system timezone.



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# File 'lib/active_support/time_with_zone.rb', line 83

def localtime(utc_offset = nil)
  utc.getlocal(utc_offset)
end

#marshal_dump ⇒ Object 



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# File 'lib/active_support/time_with_zone.rb', line 447

def marshal_dump
  [utc, time_zone.name, time]
end

#marshal_load(variables) ⇒ Object 



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# File 'lib/active_support/time_with_zone.rb', line 451

def marshal_load(variables)
  initialize(variables[0].utc, ::Time.find_zone(variables[1]), variables[2].utc)
end

#past? ⇒ Boolean

Returns true if the current object’s time is in the past.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 234

def past?
  utc.past?
end

#period ⇒ Object

Returns the underlying TZInfo::TimezonePeriod.



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# File 'lib/active_support/time_with_zone.rb', line 72

def period
  @period ||= time_zone.period_for_utc(@utc)
end

#respond_to?(sym, include_priv = false) ⇒ Boolean

respond_to_missing? is not called in some cases, such as when type conversion is performed with Kernel#String

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 457

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

#respond_to_missing?(sym, include_priv) ⇒ Boolean

Ensure proxy class responds to all methods that underlying time instance responds to.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 465

def respond_to_missing?(sym, include_priv)
  return false if sym.to_sym == :acts_like_date?
  time.respond_to?(sym, include_priv)
end

#rfc2822 ⇒ Object Also known as: rfc822

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"



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# File 'lib/active_support/time_with_zone.rb', line 194

def rfc2822
  to_s(:rfc822)
end

#strftime(format) ⇒ Object

Replaces %Z directive with +zone before passing to Time#strftime, so that zone information is correct.



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# File 'lib/active_support/time_with_zone.rb', line 217

def strftime(format)
  format = format.gsub(/((?:\A|[^%])(?:%%)*)%Z/, "\\1#{zone}")
  getlocal(utc_offset).strftime(format)
end

#time ⇒ Object

Returns a Time instance that represents the time in time_zone.



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# File 'lib/active_support/time_with_zone.rb', line 58

def time
  @time ||= period.to_local(@utc)
end

#to_a ⇒ Object

Returns Array of parts of Time in sequence of [seconds, minutes, hours, day, month, year, weekday, yearday, dst?, zone].

now = Time.zone.now     # => Tue, 18 Aug 2015 02:29:27 UTC +00:00
now.to_a                # => [27, 29, 2, 18, 8, 2015, 2, 230, false, "UTC"]



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# File 'lib/active_support/time_with_zone.rb', line 377

def to_a
  [time.sec, time.min, time.hour, time.day, time.mon, time.year, time.wday, time.yday, dst?, zone]
end

#to_datetime ⇒ Object

Returns an instance of DateTime with the timezone’s UTC offset

Time.zone.now.to_datetime                         # => Tue, 18 Aug 2015 02:32:20 +0000
Time.current.in_time_zone('Hawaii').to_datetime   # => Mon, 17 Aug 2015 16:32:20 -1000



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# File 'lib/active_support/time_with_zone.rb', line 410

def to_datetime
  utc.to_datetime.new_offset(Rational(utc_offset, 86_400))
end

#to_f ⇒ Object

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



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# File 'lib/active_support/time_with_zone.rb', line 385

def to_f
  utc.to_f
end

#to_i ⇒ Object Also known as: tv_sec

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



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# File 'lib/active_support/time_with_zone.rb', line 393

def to_i
  utc.to_i
end

#to_r ⇒ Object

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)



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# File 'lib/active_support/time_with_zone.rb', line 402

def to_r
  utc.to_r
end

#to_s(format = :default) ⇒ Object Also known as: to_formatted_s

Returns a string of the object’s date and time. Accepts an optional format:

  • :default - default value, mimics Ruby Time#to_s format.

  • :db - format outputs time in UTC :db time. See Time#to_formatted_s(:db).

  • Any key in Time::DATE_FORMATS can be used. See active_support/core_ext/time/conversions.rb.



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# File 'lib/active_support/time_with_zone.rb', line 204

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

#to_time ⇒ Object

Returns an instance of Time, either with the same UTC offset as self or in the local system timezone depending on the setting of ActiveSupport.to_time_preserves_timezone.



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# File 'lib/active_support/time_with_zone.rb', line 417

def to_time
  if preserve_timezone
    @to_time_with_instance_offset ||= getlocal(utc_offset)
  else
    @to_time_with_system_offset ||= getlocal
  end
end

#today? ⇒ Boolean

Returns true if the current object’s time falls within the current day.

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 240

def today?
  time.today?
end

#utc ⇒ Object Also known as: comparable_time, getgm, getutc, gmtime

Returns a Time instance of the simultaneous time in the UTC timezone.



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# File 'lib/active_support/time_with_zone.rb', line 63

def utc
  @utc ||= period.to_utc(@time)
end

#utc? ⇒ Boolean Also known as: gmt?

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

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 105

def utc?
  period.offset.abbreviation == :UTC || period.offset.abbreviation == :UCT
end

#utc_offset ⇒ Object Also known as: gmt_offset, gmtoff

Returns the offset from current time to UTC time in seconds.



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# File 'lib/active_support/time_with_zone.rb', line 111

def utc_offset
  period.utc_total_offset
end

#xmlschema(fraction_digits = 0) ⇒ Object Also known as: iso8601

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"



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# File 'lib/active_support/time_with_zone.rb', line 148

def xmlschema(fraction_digits = 0)
  "#{time.strftime(PRECISIONS[fraction_digits.to_i])}#{formatted_offset(true, 'Z'.freeze)}"
end

#zone ⇒ Object

Returns the time zone abbreviation.

Time.zone = 'Eastern Time (US & Canada)'   # => "Eastern Time (US & Canada)"
Time.zone.now.zone # => "EST"



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# File 'lib/active_support/time_with_zone.rb', line 133

def zone
  period.zone_identifier.to_s
end