Class: ActiveSupport::TimeWithZone

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

Overview

Active Support Time With Zone

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 15:30:45.000000000 EST -05:00
Time.zone.parse('2007-02-10 15:30:45')          # => Sat, 10 Feb 2007 15:30:45.000000000 EST -05:00
Time.zone.at(1171139445)                        # => Sat, 10 Feb 2007 15:30:45.000000000 EST -05:00
Time.zone.now                                   # => Sun, 18 May 2008 13:07:55.754107581 EDT -04:00
Time.utc(2007, 2, 10, 20, 30, 45).in_time_zone  # => Sat, 10 Feb 2007 15:30:45.000000000 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 13:27:25.031505668 EDT -04:00
t.hour                                # => 13
t.dst?                                # => true
t.utc_offset                          # => -14400
t.zone                                # => "EDT"
t.to_fs(:rfc822)                      # => "Sun, 18 May 2008 13:27:25 -0400"
t + 1.day                             # => Mon, 19 May 2008 13:27:25.031505668 EDT -04:00
t.beginning_of_year                   # => Tue, 01 Jan 2008 00:00:00.000000000 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" }

Instance Attribute 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)
  @time_zone, @time = time_zone, local_time
  if utc_time
    @utc = transfer_time_values_to_utc_constructor(utc_time)
    @period = period
  else
    @utc = nil
    @period = get_period_and_ensure_valid_local_time(period)
  end
  @is_utc = zone == "UTC" || zone == "UCT"
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing ⇒ 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 551

def method_missing(...)
  wrap_with_time_zone time.__send__(...)
rescue NoMethodError => e
  raise e, e.message.sub(time.inspect, inspect).sub("Time", "ActiveSupport::TimeWithZone"), 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

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 01:26:28.725182881 EDT -04:00
now + 1000          # => Sun, 02 Nov 2014 01:43:08.725182881 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 00:26:28.725182881 EST -05:00
now + 1.day         # => Mon, 03 Nov 2014 01:26:28.725182881 EST -05:00



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# File 'lib/active_support/time_with_zone.rb', line 310

def +(other)
  if duration_of_variable_length?(other)
    method_missing(:+, other)
  else
    result = utc + other

    result.in_time_zone(time_zone)
  end
end

#-(other) ⇒ Object

Subtracts an interval of time and returns a new TimeWithZone object unless the other value acts_like? time. In which case, it will subtract the other time and return the difference in seconds as a Float.

Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
now = Time.zone.now # => Mon, 03 Nov 2014 00:26:28.725182881 EST -05:00
now - 1000          # => Mon, 03 Nov 2014 00:09:48.725182881 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 01:26:28.725182881 EDT -04:00
now - 1.day         # => Sun, 02 Nov 2014 00:26:28.725182881 EDT -04:00

If both the TimeWithZone object and the other value act like Time, a Float will be returned.

Time.zone.now - 1.day.ago # => 86399.999967



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# File 'lib/active_support/time_with_zone.rb', line 345

def -(other)
  if other.acts_like?(:time)
    getutc - other.getutc
  elsif duration_of_variable_length?(other)
    method_missing(:-, other)
  else
    result = utc - 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 243

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 502

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 01:26:28.558049687 EDT -04:00
now.advance(seconds: 1) # => Sun, 02 Nov 2014 01:26:29.558049687 EDT -04:00
now.advance(minutes: 1) # => Sun, 02 Nov 2014 01:27:28.558049687 EDT -04:00
now.advance(hours: 1)   # => Sun, 02 Nov 2014 01:26:28.558049687 EST -05:00
now.advance(days: 1)    # => Mon, 03 Nov 2014 01:26:28.558049687 EST -05:00
now.advance(weeks: 1)   # => Sun, 09 Nov 2014 01:26:28.558049687 EST -05:00
now.advance(months: 1)  # => Tue, 02 Dec 2014 01:26:28.558049687 EST -05:00
now.advance(years: 1)   # => Mon, 02 Nov 2015 01:26:28.558049687 EST -05:00



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# File 'lib/active_support/time_with_zone.rb', line 434

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 00:26:28.725182881 EST -05:00
now.ago(1000)       # => Mon, 03 Nov 2014 00:09:48.725182881 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 01:26:28.725182881 EDT -04:00
now.ago(1.day)      # => Sun, 02 Nov 2014 00:26:28.725182881 EDT -04:00



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# File 'lib/active_support/time_with_zone.rb', line 373

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").as_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").as_json
# => "2005/02/01 05:15:10 -1000"



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# File 'lib/active_support/time_with_zone.rb', line 178

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 251

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 513

def blank?
  false
end

#change(options) ⇒ Object

Returns a new ActiveSupport::TimeWithZone where one or more of the elements have been changed according to the options parameter. The time options (:hour, :min, :sec, :usec, :nsec) reset cascadingly, so if only the hour is passed, then minute, sec, usec, and nsec is set to 0. If the hour and minute is passed, then sec, usec, and nsec is set to 0. The options parameter takes a hash with any of these keys: :year, :month, :day, :hour, :min, :sec, :usec, :nsec, :offset, :zone. Pass either :usec or :nsec, not both. Similarly, pass either :zone or :offset, not both.

t = Time.zone.now          # => Fri, 14 Apr 2017 11:45:15.116992711 EST -05:00
t.change(year: 2020)       # => Tue, 14 Apr 2020 11:45:15.116992711 EST -05:00
t.change(hour: 12)         # => Fri, 14 Apr 2017 12:00:00.000000000 EST -05:00
t.change(min: 30)          # => Fri, 14 Apr 2017 11:30:00.000000000 EST -05:00
t.change(offset: "-10:00") # => Fri, 14 Apr 2017 11:45:15.116992711 HST -10:00
t.change(zone: "Hawaii")   # => Fri, 14 Apr 2017 11:45:15.116992711 HST -10:00



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# File 'lib/active_support/time_with_zone.rb', line 394

def change(options)
  if options[:zone] && options[:offset]
    raise ArgumentError, "Can't change both :offset and :zone at the same time: #{options.inspect}"
  end

  new_time = time.change(options)

  if options[:zone]
    new_zone = ::Time.find_zone(options[:zone])
  elsif options[:offset]
    new_zone = ::Time.find_zone(new_time.utc_offset)
  end

  new_zone ||= time_zone
  periods = new_zone.periods_for_local(new_time)

  self.class.new(nil, new_zone, new_time, periods.include?(period) ? period : nil)
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 100

def dst?
  period.dst?
end

#encode_with(coder) ⇒ Object

:nodoc:



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# File 'lib/active_support/time_with_zone.rb', line 190

def encode_with(coder) # :nodoc:
  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 286

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 131

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 521

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 281

def future?
  utc.future?
end

#hash ⇒ Object 



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# File 'lib/active_support/time_with_zone.rb', line 290

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 198

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 83

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 186

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 # => "2024-11-13 07:00:10.528054960 UTC +00:00"



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# File 'lib/active_support/time_with_zone.rb', line 146

def inspect
  "#{time.strftime('%F %H:%M:%S.%9N')} #{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 507

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 89

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 527

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 531

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 256

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 78

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

#present? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 517

def present? # :nodoc:
  true
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 537

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 545

def respond_to_missing?(sym, include_priv)
  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 206

def rfc2822
  to_fs(: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 237

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 64

def time
  @time ||= incorporate_utc_offset(@utc, utc_offset)
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 02:29:27.485278555 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 457

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 490

def to_datetime
  @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 465

def to_f
  utc.to_f
end

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

Returns a string of the object’s date and time.

This method is aliased to to_formatted_s.

Accepts an optional format:

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

  • :db - format outputs time in UTC :db time. See Time#to_fs(: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 224

def to_fs(format = :default)
  if format == :db
    utc.to_fs(format)
  elsif formatter = ::Time::DATE_FORMATS[format]
    formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
  else
    to_s
  end
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 473

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 482

def to_r
  utc.to_r
end

#to_s ⇒ Object

Returns a string of the object’s date and time.



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# File 'lib/active_support/time_with_zone.rb', line 212

def to_s
  "#{time.strftime("%Y-%m-%d %H:%M:%S")} #{formatted_offset(false, 'UTC')}" # mimicking Ruby Time#to_s format
end

#to_time ⇒ Object

Returns an instance of Time, either with the same timezone as self, 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 497

def to_time
  @to_time_with_timezone ||= getlocal(time_zone)
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 262

def today?
  time.today?
end

#tomorrow? ⇒ Boolean Also known as: next_day?

Returns true if the current object’s time falls within the next day (tomorrow).

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 268

def tomorrow?
  time.tomorrow?
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 69

def utc
  @utc ||= incorporate_utc_offset(@time, -utc_offset)
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 111

def utc?
  @is_utc
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 117

def utc_offset
  period.observed_utc_offset
end

#xmlschema(fraction_digits = 0) ⇒ Object Also known as: iso8601, rfc3339

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 154

def xmlschema(fraction_digits = 0)
  if @is_utc
    utc.iso8601(fraction_digits || 0)
  else
    str = time.iso8601(fraction_digits || 0)
    str[-1] = formatted_offset(true, "Z")
    str
  end
end

#yesterday? ⇒ Boolean Also known as: prev_day?

Returns true if the current object’s time falls within the previous day (yesterday).

Returns:

  • (Boolean) 


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# File 'lib/active_support/time_with_zone.rb', line 275

def yesterday?
  time.yesterday?
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 139

def zone
  period.abbreviation
end