edge badge
Skip to Content Skip to Search
Methods
#
A
B
C
D
E
F
G
I
L
M
N
R
S
T
U
Included Modules

Class Public methods

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
# 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

current()

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

# 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

Instance Public methods

<=>(other)

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 204
def <=>(other)
  if other.respond_to? :to_datetime
    super other.to_datetime rescue nil
  else
    super
  end
end

acts_like_date?()

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

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

acts_like_time?()

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

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

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.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 78
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

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!

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 105
def ago(seconds)
  since(-seconds)
end

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).

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 118
def beginning_of_day
  change(hour: 0)
end

beginning_of_hour()

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

Also aliased as: at_beginning_of_hour
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 142
def beginning_of_hour
  change(min: 0)
end

beginning_of_minute()

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

Also aliased as: at_beginning_of_minute
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 154
def beginning_of_minute
  change(sec: 0)
end

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)
# 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

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
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 136
def end_of_day
  change(hour: 23, min: 59, sec: 59, usec: Rational(999999999, 1000))
end

end_of_hour()

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

Also aliased as: at_end_of_hour
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 148
def end_of_hour
  change(min: 59, sec: 59, usec: Rational(999999999, 1000))
end

end_of_minute()

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

Also aliased as: at_end_of_minute
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 160
def end_of_minute
  change(sec: 59, usec: Rational(999999999, 1000))
end

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"
# 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

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
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 166
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

midday()

Alias for: middle_of_day

middle_of_day()

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 126
def middle_of_day
  change(hour: 12)
end

midnight()

Alias for: beginning_of_day

noon()

Alias for: middle_of_day

nsec()

Returns the fraction of a second as nanoseconds

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

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

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

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
# 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

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
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 112
def since(seconds)
  self + Rational(seconds, 86400)
end

subsec()

Returns the fraction of a second as a Rational

DateTime.new(2012, 8, 29, 0, 0, 0.5).subsec # => (1/2)
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 36
def subsec
  sec_fraction
end

to_default_s(format = :default)

Alias for: to_s

to_f()

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

# 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

to_formatted_s(format = :default)

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

This method is aliased to to_s.

Examples

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

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

Adding your own datetime formats to to_formatted_s

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

to_i()

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

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

to_s(format = :default)

Also aliased as: to_default_s
Alias for: to_formatted_s

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.

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

usec()

Returns the fraction of a second as microseconds

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

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
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 180
def utc
  utc = new_offset(0)

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

utc?()

Returns true if offset == 0.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 193
def utc?
  offset == 0
end

utc_offset()

Returns the offset value in seconds.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 198
def utc_offset
  (offset * 86400).to_i
end