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

Methods

Constants

PRECISIONS = Hash.new { |h, n| h[n] = "%FT%T.%#{n}N" }
SECONDS_PER_DAY = 86400

Attributes

[R] time_zone

Class Public methods

new(utc_time, time_zone, local_time = nil, period = nil)

📝 Source code 
# File activesupport/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
🔎 See on GitHub

Instance Public methods

+(other)

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
Also aliased as: since, in
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 299
    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
🔎 See on GitHub

-(other)

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
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 333
    def -(other)
      if other.acts_like?(:time)
        getutc - other.getutc
      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
🔎 See on GitHub

<=>(other)

Use the time in UTC for comparisons.

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 232
    def <=>(other)
      utc <=> other
    end
🔎 See on GitHub

acts_like_time?()

So that self acts_like?(:time).

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 494
    def acts_like_time?
      true
    end
🔎 See on GitHub

advance(options)

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
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 422
    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
🔎 See on GitHub

ago(other)

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
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 361
    def ago(other)
      since(-other)
    end
🔎 See on GitHub

as_json(options = nil)

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"
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 166
    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
🔎 See on GitHub

between?(min, max)

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 240
    def between?(min, max)
      utc.between?(min, max)
    end
🔎 See on GitHub

blank?()

An instance of ActiveSupport::TimeWithZone is never blank

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 505
    def blank?
      false
    end
🔎 See on GitHub

change(options)

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
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 382
    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
🔎 See on GitHub

comparable_time()

Alias for: utc

dst?()

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
Also aliased as: isdst
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 94
    def dst?
      period.dst?
    end
🔎 See on GitHub

eql?(other)

Returns true if other is equal to current object.

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 275
    def eql?(other)
      other.eql?(utc)
    end
🔎 See on GitHub

formatted_offset(colon = true, alternate_utc_string = nil)

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"
📝 Source code 
# File activesupport/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
🔎 See on GitHub

freeze()

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 513
    def freeze
      # preload instance variables before freezing
      period; utc; time; to_datetime; to_time
      super
    end
🔎 See on GitHub

future?()

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 270
    def future?
      utc.future?
    end
🔎 See on GitHub

getgm()

Alias for: utc

getlocal(utc_offset = nil)

Alias for: localtime

getutc()

Alias for: utc

gmt?()

Alias for: utc?

gmt_offset()

Alias for: utc_offset

gmtime()

Alias for: utc

gmtoff()

Alias for: utc_offset

hash()

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 279
    def hash
      utc.hash
    end
🔎 See on GitHub

httpdate()

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"
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 186
    def httpdate
      utc.httpdate
    end
🔎 See on GitHub

in(other)

Alias for: +

in_time_zone(new_zone = ::Time.zone)

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

📝 Source code 
# File activesupport/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
🔎 See on GitHub

inspect()

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

Time.zone.now.inspect # => "Thu, 04 Dec 2014 11:00:25.624541392 EST -05:00"
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 140
    def inspect
      "#{time.strftime('%a, %d %b %Y %H:%M:%S.%9N')} #{zone} #{formatted_offset}"
    end
🔎 See on GitHub

is_a?(klass)

Say we’re a Time to thwart type checking.

Also aliased as: kind_of?
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 499
    def is_a?(klass)
      klass == ::Time || super
    end
🔎 See on GitHub

isdst()

Alias for: dst?

iso8601(fraction_digits = 0)

Alias for: xmlschema

kind_of?(klass)

Alias for: is_a?

localtime(utc_offset = nil)

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

Also aliased as: getlocal
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 83
    def localtime(utc_offset = nil)
      utc.getlocal(utc_offset)
    end
🔎 See on GitHub

marshal_dump()

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 519
    def marshal_dump
      [utc, time_zone.name, time]
    end
🔎 See on GitHub

marshal_load(variables)

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 523
    def marshal_load(variables)
      initialize(variables[0].utc, ::Time.find_zone(variables[1]), variables[2].utc)
    end
🔎 See on GitHub

method_missing(...)

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 544
    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
🔎 See on GitHub

next_day?()

Alias for: tomorrow?

past?()

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 245
    def past?
      utc.past?
    end
🔎 See on GitHub

period()

Returns the underlying TZInfo::TimezonePeriod.

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 72
    def period
      @period ||= time_zone.period_for_utc(@utc)
    end
🔎 See on GitHub

prev_day?()

Alias for: yesterday?

respond_to?(sym, include_priv = false)

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 529
    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
🔎 See on GitHub

respond_to_missing?(sym, include_priv)

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 537
    def respond_to_missing?(sym, include_priv)
      return false if sym.to_sym == :acts_like_date?
      time.respond_to?(sym, include_priv)
    end
🔎 See on GitHub

rfc2822()

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"
Also aliased as: rfc822
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 194
    def rfc2822
      to_fs(:rfc822)
    end
🔎 See on GitHub

rfc3339(fraction_digits = 0)

Alias for: xmlschema

rfc822()

Alias for: rfc2822

since(other)

Alias for: +

strftime(format)

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 226
    def strftime(format)
      format = format.gsub(/((?:\A|[^%])(?:%%)*)%Z/, "\\1#{zone}")
      getlocal(utc_offset).strftime(format)
    end
🔎 See on GitHub

time()

Returns a Time instance that represents the time in time_zone.

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 58
    def time
      @time ||= incorporate_utc_offset(@utc, utc_offset)
    end
🔎 See on GitHub

to_a()

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"]
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 445
    def to_a
      [time.sec, time.min, time.hour, time.day, time.mon, time.year, time.wday, time.yday, dst?, zone]
    end
🔎 See on GitHub

to_datetime()

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
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 478
    def to_datetime
      @to_datetime ||= utc.to_datetime.new_offset(Rational(utc_offset, 86_400))
    end
🔎 See on GitHub

to_f()

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
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 453
    def to_f
      utc.to_f
    end
🔎 See on GitHub

to_formatted_s(format = :default)

Alias for: to_fs

to_fs(format = :default)

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.

Also aliased as: to_formatted_s
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 212
    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
        # Change to to_s when deprecation is gone.
        "#{time.strftime("%Y-%m-%d %H:%M:%S")} #{formatted_offset(false, 'UTC')}"
      end
    end
🔎 See on GitHub

to_i()

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
Also aliased as: tv_sec
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 461
    def to_i
      utc.to_i
    end
🔎 See on GitHub

to_r()

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)
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 470
    def to_r
      utc.to_r
    end
🔎 See on GitHub

to_s()

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 200
    def to_s
      "#{time.strftime("%Y-%m-%d %H:%M:%S")} #{formatted_offset(false, 'UTC')}" # mimicking Ruby Time#to_s format
    end
🔎 See on GitHub

to_time()

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.

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 485
    def to_time
      if preserve_timezone
        @to_time_with_instance_offset ||= getlocal(utc_offset)
      else
        @to_time_with_system_offset ||= getlocal
      end
    end
🔎 See on GitHub

today?()

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

📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 251
    def today?
      time.today?
    end
🔎 See on GitHub

tomorrow?()

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

Also aliased as: next_day?
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 257
    def tomorrow?
      time.tomorrow?
    end
🔎 See on GitHub

tv_sec()

Alias for: to_i

utc()

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

Also aliased as: comparable_time, getgm, getutc, gmtime
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 63
    def utc
      @utc ||= incorporate_utc_offset(@time, -utc_offset)
    end
🔎 See on GitHub

utc?()

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
Also aliased as: gmt?
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 105
    def utc?
      zone == "UTC" || zone == "UCT"
    end
🔎 See on GitHub

utc_offset()

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

Also aliased as: gmt_offset, gmtoff
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 111
    def utc_offset
      period.observed_utc_offset
    end
🔎 See on GitHub

xmlschema(fraction_digits = 0)

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"
Also aliased as: iso8601, rfc3339
📝 Source code 
# File activesupport/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')}"
    end
🔎 See on GitHub

yesterday?()

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

Also aliased as: prev_day?
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 264
    def yesterday?
      time.yesterday?
    end
🔎 See on GitHub

zone()

Returns the time zone abbreviation.

Time.zone = 'Eastern Time (US & Canada)'   # => "Eastern Time (US & Canada)"
Time.zone.now.zone # => "EST"
📝 Source code 
# File activesupport/lib/active_support/time_with_zone.rb, line 133
    def zone
      period.abbreviation
    end
🔎 See on GitHub