DateTime

civil_from_format(utc_or_local, year, month = 1, day = 1, hour = 0, min = 0, sec = 0)

Returns DateTime with local offset for given year if format is local else offset is zero.

DateTime.civil_from_format :local, 2012
# => Sun, 01 Jan 2012 00:00:00 +0300
DateTime.civil_from_format :local, 2012, 12, 17
# => Mon, 17 Dec 2012 00:00:00 +0000

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 69
  def self.civil_from_format(utc_or_local, year, month = 1, day = 1, hour = 0, min = 0, sec = 0)
    if utc_or_local.to_sym == :local
      offset = ::Time.local(year, month, day).utc_offset.to_r / 86400
    else
      offset = 0
    end
    civil(year, month, day, hour, min, sec, offset)
  end

🔎 See on GitHub

current()

Returns Time.zone.now.to_datetime when Time.zone or config.time_zone are set, otherwise returns Time.now.to_datetime.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 10
    def current
      ::Time.zone ? ::Time.zone.now.to_datetime : ::Time.now.to_datetime
    end

🔎 See on GitHub

<=>(other)

Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 208
  def <=>(other)
    if other.respond_to? :to_datetime
      super other.to_datetime rescue nil
    else
      super
    end
  end

🔎 See on GitHub

acts_like_date?()

Duck-types as a Date-like class. See Object#acts_like?.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 8
  def acts_like_date?
    true
  end

🔎 See on GitHub

acts_like_time?()

Duck-types as a Time-like class. See Object#acts_like?.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 13
  def acts_like_time?
    true
  end

🔎 See on GitHub

advance(options)

Uses Date to provide precise Time calculations for years, months, and days. The options parameter takes a hash with any of these keys: :years, :months, :weeks, :days, :hours, :minutes, :seconds.

Just like Date#advance, increments are applied in order of time units from largest to smallest. This order can affect the result around the end of a month.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 82
  def advance(options)
    unless options[:weeks].nil?
      options[:weeks], partial_weeks = options[:weeks].divmod(1)
      options[:days] = options.fetch(:days, 0) + 7 * partial_weeks
    end

    unless options[:days].nil?
      options[:days], partial_days = options[:days].divmod(1)
      options[:hours] = options.fetch(:hours, 0) + 24 * partial_days
    end

    d = to_date.advance(options)
    datetime_advanced_by_date = change(year: d.year, month: d.month, day: d.day)
    seconds_to_advance = \
      options.fetch(:seconds, 0) +
      options.fetch(:minutes, 0) * 60 +
      options.fetch(:hours, 0) * 3600

    if seconds_to_advance.zero?
      datetime_advanced_by_date
    else
      datetime_advanced_by_date.since(seconds_to_advance)
    end
  end

🔎 See on GitHub

ago(seconds)

Returns a new DateTime representing the time a number of seconds ago. Do not use this method in combination with x.months, use months_ago instead!

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 109
  def ago(seconds)
    since(-seconds)
  end

🔎 See on GitHub

at_beginning_of_day()

Alias for: beginning_of_day

at_beginning_of_hour()

Alias for: beginning_of_hour

at_beginning_of_minute()

Alias for: beginning_of_minute

at_end_of_day()

Alias for: end_of_day

at_end_of_hour()

Alias for: end_of_hour

at_end_of_minute()

Alias for: end_of_minute

at_midday()

Alias for: middle_of_day

at_middle_of_day()

Alias for: middle_of_day

at_midnight()

Alias for: beginning_of_day

at_noon()

Alias for: middle_of_day

beginning_of_day()

Returns a new DateTime representing the start of the day (0:00).

Also aliased as: midnight, at_midnight, at_beginning_of_day

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 122
  def beginning_of_day
    change(hour: 0)
  end

🔎 See on GitHub

beginning_of_hour()

Returns a new DateTime representing the start of the hour (hh:00:00).

Also aliased as: at_beginning_of_hour

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 146
  def beginning_of_hour
    change(min: 0)
  end

🔎 See on GitHub

beginning_of_minute()

Returns a new DateTime representing the start of the minute (hh:mm:00).

Also aliased as: at_beginning_of_minute

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 158
  def beginning_of_minute
    change(sec: 0)
  end

🔎 See on GitHub

change(options)

Returns a new DateTime where one or more of the elements have been changed according to the options parameter. The time options (:hour, :min, :sec) reset cascadingly, so if only the hour is passed, then minute and sec is set to 0. If the hour and minute is passed, then sec is set to 0. The options parameter takes a hash with any of these keys: :year, :month, :day, :hour, :min, :sec, :offset, :start.

DateTime.new(2012, 8, 29, 22, 35, 0).change(day: 1)              # => DateTime.new(2012, 8, 1, 22, 35, 0)
DateTime.new(2012, 8, 29, 22, 35, 0).change(year: 1981, day: 1)  # => DateTime.new(1981, 8, 1, 22, 35, 0)
DateTime.new(2012, 8, 29, 22, 35, 0).change(year: 1981, hour: 0) # => DateTime.new(1981, 8, 29, 0, 0, 0)

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 51
  def change(options)
    if new_nsec = options[:nsec]
      raise ArgumentError, "Can't change both :nsec and :usec at the same time: #{options.inspect}" if options[:usec]
      new_fraction = Rational(new_nsec, 1000000000)
    else
      new_usec = options.fetch(:usec, (options[:hour] || options[:min] || options[:sec]) ? 0 : Rational(nsec, 1000))
      new_fraction = Rational(new_usec, 1000000)
    end

    raise ArgumentError, "argument out of range" if new_fraction >= 1

    ::DateTime.civil(
      options.fetch(:year, year),
      options.fetch(:month, month),
      options.fetch(:day, day),
      options.fetch(:hour, hour),
      options.fetch(:min, options[:hour] ? 0 : min),
      options.fetch(:sec, (options[:hour] || options[:min]) ? 0 : sec) + new_fraction,
      options.fetch(:offset, offset),
      options.fetch(:start, start)
    )
  end

🔎 See on GitHub

default_inspect()

Alias for: inspect

end_of_day()

Returns a new DateTime representing the end of the day (23:59:59).

Also aliased as: at_end_of_day

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 140
  def end_of_day
    change(hour: 23, min: 59, sec: 59, usec: Rational(999999999, 1000))
  end

🔎 See on GitHub

end_of_hour()

Returns a new DateTime representing the end of the hour (hh:59:59).

Also aliased as: at_end_of_hour

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 152
  def end_of_hour
    change(min: 59, sec: 59, usec: Rational(999999999, 1000))
  end

🔎 See on GitHub

end_of_minute()

Returns a new DateTime representing the end of the minute (hh:mm:59).

Also aliased as: at_end_of_minute

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 164
  def end_of_minute
    change(sec: 59, usec: Rational(999999999, 1000))
  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.

datetime = DateTime.civil(2000, 1, 1, 0, 0, 0, Rational(-6, 24))
datetime.formatted_offset         # => "-06:00"
datetime.formatted_offset(false)  # => "-0600"

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 51
  def formatted_offset(colon = true, alternate_utc_string = nil)
    utc? && alternate_utc_string || ActiveSupport::TimeZone.seconds_to_utc_offset(utc_offset, colon)
  end

🔎 See on GitHub

getgm()

Alias for: utc

getlocal(utc_offset = nil)

Alias for: localtime

getutc()

Alias for: utc

gmtime()

Alias for: utc

in(seconds)

Alias for: since

inspect()

Also aliased as: default_inspect

Alias for: readable_inspect

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/core_ext/date_time/calculations.rb, line 170
  def localtime(utc_offset = nil)
    utc = new_offset(0)

    Time.utc(
      utc.year, utc.month, utc.day,
      utc.hour, utc.min, utc.sec + utc.sec_fraction
    ).getlocal(utc_offset)
  end

🔎 See on GitHub

midday()

Alias for: middle_of_day

middle_of_day()

Returns a new DateTime representing the middle of the day (12:00)

Also aliased as: midday, noon, at_midday, at_noon, at_middle_of_day

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 130
  def middle_of_day
    change(hour: 12)
  end

🔎 See on GitHub

midnight()

Alias for: beginning_of_day

noon()

Alias for: middle_of_day

nsec()

Returns the fraction of a second as nanoseconds

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 94
  def nsec
    (sec_fraction * 1_000_000_000).to_i
  end

🔎 See on GitHub

readable_inspect()

Overrides the default inspect method with a human readable one, e.g., “Mon, 21 Feb 2005 14:30:00 +0000”.

Also aliased as: inspect

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 56
  def readable_inspect
    to_fs(:rfc822)
  end

🔎 See on GitHub

seconds_since_midnight()

Returns the number of seconds since 00:00:00.

DateTime.new(2012, 8, 29,  0,  0,  0).seconds_since_midnight # => 0
DateTime.new(2012, 8, 29, 12, 34, 56).seconds_since_midnight # => 45296
DateTime.new(2012, 8, 29, 23, 59, 59).seconds_since_midnight # => 86399

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 20
  def seconds_since_midnight
    sec + (min * 60) + (hour * 3600)
  end

🔎 See on GitHub

seconds_until_end_of_day()

Returns the number of seconds until 23:59:59.

DateTime.new(2012, 8, 29,  0,  0,  0).seconds_until_end_of_day # => 86399
DateTime.new(2012, 8, 29, 12, 34, 56).seconds_until_end_of_day # => 41103
DateTime.new(2012, 8, 29, 23, 59, 59).seconds_until_end_of_day # => 0

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 29
  def seconds_until_end_of_day
    end_of_day.to_i - to_i
  end

🔎 See on GitHub

since(seconds)

Returns a new DateTime representing the time a number of seconds since the instance time. Do not use this method in combination with x.months, use months_since instead!

Also aliased as: in

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 116
  def since(seconds)
    self + Rational(seconds, 86400)
  end

🔎 See on GitHub

subsec()

Returns the fraction of a second as a Rational

DateTime.new(2012, 8, 29, 0, 0, 0.5).subsec # => (1/2)

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 36
  def subsec
    sec_fraction
  end

🔎 See on GitHub

to_f()

Converts self to a floating-point number of seconds, including fractional microseconds, since the Unix epoch.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 79
  def to_f
    seconds_since_unix_epoch.to_f + sec_fraction
  end

🔎 See on GitHub

to_formatted_s(format = :default)

Alias for: to_fs

to_fs(format = :default)

Convert to a formatted string. See Time::DATE_FORMATS for predefined formats.

This method is aliased to to_formatted_s.

Examples

datetime = DateTime.civil(2007, 12, 4, 0, 0, 0, 0)   # => Tue, 04 Dec 2007 00:00:00 +0000

datetime.to_fs(:db)            # => "2007-12-04 00:00:00"
datetime.to_formatted_s(:db)   # => "2007-12-04 00:00:00"
datetime.to_fs(:number)        # => "20071204000000"
datetime.to_fs(:short)         # => "04 Dec 00:00"
datetime.to_fs(:long)          # => "December 04, 2007 00:00"
datetime.to_fs(:long_ordinal)  # => "December 4th, 2007 00:00"
datetime.to_fs(:rfc822)        # => "Tue, 04 Dec 2007 00:00:00 +0000"
datetime.to_fs(:iso8601)       # => "2007-12-04T00:00:00+00:00"

Adding your own datetime formats to `to_fs`

DateTime formats are shared with Time. You can add your own to the Time::DATE_FORMATS hash. Use the format name as the hash key and either a strftime string or Proc instance that takes a time or datetime argument as the value.

# config/initializers/time_formats.rb
Time::DATE_FORMATS[:month_and_year] = '%B %Y'
Time::DATE_FORMATS[:short_ordinal] = lambda { |time| time.strftime("%B #{time.day.ordinalize}") }

Also aliased as: to_formatted_s

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 35
  def to_fs(format = :default)
    if formatter = ::Time::DATE_FORMATS[format]
      formatter.respond_to?(:call) ? formatter.call(self).to_s : strftime(formatter)
    else
      to_s
    end
  end

🔎 See on GitHub

to_i()

Converts self to an integer number of seconds since the Unix epoch.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 84
  def to_i
    seconds_since_unix_epoch.to_i
  end

🔎 See on GitHub

to_time()

Either return an instance of Time with the same UTC offset as self or an instance of Time representing the same time in the local system timezone depending on the setting of on the setting of ActiveSupport.to_time_preserves_timezone.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/compatibility.rb, line 15
  def to_time
    preserve_timezone ? getlocal(utc_offset) : getlocal
  end

🔎 See on GitHub

usec()

Returns the fraction of a second as microseconds

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 89
  def usec
    (sec_fraction * 1_000_000).to_i
  end

🔎 See on GitHub

utc()

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

DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24))     # => Mon, 21 Feb 2005 10:11:12 -0600
DateTime.civil(2005, 2, 21, 10, 11, 12, Rational(-6, 24)).utc # => Mon, 21 Feb 2005 16:11:12 UTC

Also aliased as: getgm, getutc, gmtime

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 184
  def utc
    utc = new_offset(0)

    Time.utc(
      utc.year, utc.month, utc.day,
      utc.hour, utc.min, utc.sec + utc.sec_fraction
    )
  end

🔎 See on GitHub

utc?()

Returns true if offset == 0.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 197
  def utc?
    offset == 0
  end

🔎 See on GitHub

utc_offset()

Returns the offset value in seconds.

📝 Source code

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 202
  def utc_offset
    (offset * 86400).to_i
  end

🔎 See on GitHub

DateTime < Object

Methods

Included Modules

Class Public methods

civil_from_format(utc_or_local, year, month = 1, day = 1, hour = 0, min = 0, sec = 0)

current()

Instance Public methods

<=>(other)

acts_like_date?()

acts_like_time?()

advance(options)

ago(seconds)

at_beginning_of_day()

at_beginning_of_hour()

at_beginning_of_minute()

at_end_of_day()

at_end_of_hour()

at_end_of_minute()

at_midday()

at_middle_of_day()

at_midnight()

at_noon()

beginning_of_day()

beginning_of_hour()

beginning_of_minute()

change(options)

default_inspect()

end_of_day()

end_of_hour()

end_of_minute()

formatted_offset(colon = true, alternate_utc_string = nil)

getgm()

getlocal(utc_offset = nil)

getutc()

gmtime()

in(seconds)

inspect()

localtime(utc_offset = nil)

midday()

middle_of_day()

midnight()

noon()

nsec()

readable_inspect()

seconds_since_midnight()

seconds_until_end_of_day()

since(seconds)

subsec()

to_f()

to_formatted_s(format = :default)

to_fs(format = :default)

Examples

Adding your own datetime formats to to_fs

to_i()

to_time()

usec()

utc()

utc?()

utc_offset()

Adding your own datetime formats to `to_fs`