class DateTime

Parent:: Object
Included modules:: DateAndTime::Zones

Public Class Methods

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

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 65
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() Show source

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 8
def current
  ::Time.zone ? ::Time.zone.now.to_datetime : ::Time.now.to_datetime
end

Public Instance Methods

<=>(other) Show source

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

Calls superclass method

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 153
def <=>(other)
  if other.kind_of?(Infinity)
    super
  elsif other.respond_to? :to_datetime
    super other.to_datetime
  else
    nil
  end
end

acts_like_date?() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 6
def acts_like_date?
  true
end

acts_like_time?() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 11
def acts_like_time?
  true
end

advance(options) Show source

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 55
def advance(options)
  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) Show source

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 72
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() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 85
def beginning_of_day
  change(:hour => 0)
end

Also aliased as: midnight, at_midnight, at_beginning_of_day

beginning_of_hour() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 109
def beginning_of_hour
  change(:min => 0)
end

Also aliased as: at_beginning_of_hour

beginning_of_minute() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 121
def beginning_of_minute
  change(:sec => 0)
end

Also aliased as: at_beginning_of_minute

change(options) Show source

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 38
def change(options)
  ::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 + sec_fraction),
    options.fetch(:offset, offset),
    options.fetch(:start, start)
  )
end

default_inspect()

Alias for: inspect

end_of_day() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 103
def end_of_day
  change(:hour => 23, :min => 59, :sec => 59)
end

Also aliased as: at_end_of_day

end_of_hour() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 115
def end_of_hour
  change(:min => 59, :sec => 59)
end

Also aliased as: at_end_of_hour

end_of_minute() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 127
def end_of_minute
  change(:sec => 59)
end

Also aliased as: at_end_of_minute

formatted_offset(colon = true, alternate_utc_string = nil) Show source

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 47
def formatted_offset(colon = true, alternate_utc_string = nil)
  utc? && alternate_utc_string || ActiveSupport::TimeZone.seconds_to_utc_offset(utc_offset, colon)
end

getutc()

Alias for: utc

in(seconds)

Alias for: since

inspect()

Also aliased as: default_inspect

Alias for: readable_inspect

midday()

Alias for: middle_of_day

middle_of_day() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 93
def middle_of_day
  change(:hour => 12)
end

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

midnight()

Alias for: beginning_of_day

noon()

Alias for: middle_of_day

nsec() Show source

Returns the fraction of a second as nanoseconds

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 90
def nsec
  (sec_fraction * 1_000_000_000).to_i
end

readable_inspect() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 52
def readable_inspect
  to_s(:rfc822)
end

Also aliased as: inspect

seconds_since_midnight() Show source

Seconds since midnight: DateTime.now.seconds_since_midnight.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 14
def seconds_since_midnight
  sec + (min * 60) + (hour * 3600)
end

seconds_until_end_of_day() Show source

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 23
def seconds_until_end_of_day
  end_of_day.to_i - to_i
end

since(seconds) Show source

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!

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 79
def since(seconds)
  self + Rational(seconds.round, 86400)
end

Also aliased as: in

to_default_s(format = :default)

Alias for: to_s

to_f() Show source

Converts self to a floating-point number of seconds since the Unix epoch.

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 75
def to_f
  seconds_since_unix_epoch.to_f
end

to_formatted_s(format = :default) Show source

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}") }

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 33
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

Also aliased as: to_s

to_i() Show source

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

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 80
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

usec() Show source

Returns the fraction of a second as microseconds

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 85
def usec
  (sec_fraction * 1_000_000).to_i
end

utc() Show source

Adjusts DateTime to UTC by adding its offset value; offset is set to 0.

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 +0000

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 136
def utc
  new_offset(0)
end

Also aliased as: getutc

utc?() Show source

Returns true if offset == 0.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 142
def utc?
  offset == 0
end

utc_offset() Show source

Returns the offset value in seconds.

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 147
def utc_offset
  (offset * 86400).to_i
end