DateTime

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

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 77
def self.civil_from_format(utc_or_local, year, month=1, day=1, hour=0, min=0, sec=0)
  offset = utc_or_local.to_sym == :local ? local_offset : 0
  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.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 11
def current
  ::Time.zone ? ::Time.zone.now.to_datetime : ::Time.now.to_datetime
end

local_offset()

DateTimes aren’t aware of DST rules, so use a consistent non-DST offset when creating a DateTime with an offset in the local zone

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 6
def local_offset
  ::Time.local(2012).utc_offset.to_r / 86400
end

<=>(other)

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 140
def <=>(other)
  super other.to_datetime
end

acts_like_date?()

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 5
def acts_like_date?
  true
end

acts_like_time?()

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 10
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.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 51
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[:seconds] || 0) + (options[:minutes] || 0) * 60 + (options[:hours] || 0) * 3600
  seconds_to_advance == 0 ? datetime_advanced_by_date : datetime_advanced_by_date.since(seconds_to_advance)
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!

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 60
def ago(seconds)
  since(-seconds)
end

at_beginning_of_day()

at_beginning_of_hour()

at_midnight()

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: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 72
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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 85
def beginning_of_hour
  change(:min => 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, minute, 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.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 34
def change(options)
  ::DateTime.civil(
    options[:year]  || year,
    options[:month] || month,
    options[:day]   || day,
    options[:hour]  || hour,
    options[:min]   || (options[:hour] ? 0 : min),
    options[:sec]   || ((options[:hour] || options[:min]) ? 0 : sec),
    options[:offset]  || offset,
    options[:start]  || start
  )
end

default_inspect()

end_of_day()

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 80
def end_of_day
  change(:hour => 23, :min => 59, :sec => 59)
end

end_of_hour()

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 91
def end_of_hour
  change(:min => 59, :sec => 59)
end

formatted_offset(colon = true, alternate_utc_string = nil)

Returns the utc_offset as an +HH:MM formatted string. Examples:

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 50
def formatted_offset(colon = true, alternate_utc_string = nil)
  utc? && alternate_utc_string || ActiveSupport::TimeZone.seconds_to_utc_offset(utc_offset, colon)
end

future?()

Tells whether the DateTime object’s datetime lies in the future

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 22
def future?
  self > ::DateTime.current
end

getutc()

in(seconds)

in_time_zone(zone = ::Time.zone)

Returns the simultaneous time in Time.zone.

Time.zone = 'Hawaii'             # => 'Hawaii'
DateTime.new(2000).in_time_zone  # => Fri, 31 Dec 1999 14:00:00 HST -10:00

This method is similar to Time#localtime, except that it uses Time.zone as the local zone instead of the operating system’s time zone.

You can also pass in a TimeZone instance or string that identifies a TimeZone as an argument, and the conversion will be based on that zone instead of Time.zone.

DateTime.new(2000).in_time_zone('Alaska')  # => Fri, 31 Dec 1999 15:00:00 AKST -09:00

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/zones.rb, line 16
def in_time_zone(zone = ::Time.zone)
  return self unless zone

  ActiveSupport::TimeWithZone.new(utc? ? self : getutc, ::Time.find_zone!(zone))
end

inspect()

Also aliased as: default_inspect

midnight()

past?()

Tells whether the DateTime object’s datetime lies in the past

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 17
def past?
  self < ::DateTime.current
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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 55
def readable_inspect
  to_s(:rfc822)
end

seconds_since_midnight()

Seconds since midnight: DateTime.now.#seconds_since_midnight

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 27
def seconds_since_midnight
  sec + (min * 60) + (hour * 3600)
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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 66
def since(seconds)
  self + Rational(seconds.round, 86400)
end

to_date()

Converts self to a Ruby Date object; time portion is discarded.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 62
def to_date
  ::Date.new(year, month, day)
end

to_datetime()

To be able to keep Times, Dates and DateTimes interchangeable on conversions.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 73
def to_datetime
  self
end

to_default_s(format = :default)

to_f()

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

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 88
def to_f
  seconds_since_unix_epoch.to_f
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"

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

Source: show | on GitHub

# 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.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 93
def to_i
  seconds_since_unix_epoch.to_i
end

to_s(format = :default)

Also aliased as: to_default_s

to_time()

Attempts to convert self to a Ruby Time object; returns self if out of range of Ruby Time class. If self has an offset other than 0, self will just be returned unaltered, since there’s no clean way to map it to a Time.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 68
def to_time
  self.offset == 0 ? ::Time.utc_time(year, month, day, hour, min, sec, sec_fraction * (RUBY_VERSION < '1.9' ? 86400000000 : 1000000)) : self
end

utc()

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

Example:

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

Also aliased as: getutc

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 124
def utc
  new_offset(0)
end

utc?()

Returns true if offset == 0

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 130
def utc?
  offset == 0
end

utc_offset()

Returns the offset value in seconds

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 135
def utc_offset
  (offset * 86400).to_i
end

xmlschema()

Converts datetime to an appropriate format for use in XML.

Source: show | on GitHub

# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 83
def xmlschema
  strftime("%Y-%m-%dT%H:%M:%S%Z")
end

Class DateTime < Object

Examples

Adding your own datetime formats to #to_formatted_s