class DateTime
Inherits From
-
module
DateAndTime::
Compatibility
Public class methods
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 GitHub
# 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
Returns Time.zone.now.to_datetime
when Time.zone
or config.time_zone
are set, otherwise returns Time.now.to_datetime
.
Source code GitHub
# 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
Public instance methods
Layers additional behavior on DateTime#<=>
so that Time and ActiveSupport::TimeWithZone
instances can be compared with a DateTime
.
Source code GitHub
# 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
Duck-types as a Date-like class. See Object#acts_like?
.
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 8
def acts_like_date?
true
end
Duck-types as a Time-like class. See Object#acts_like?
.
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/acts_like.rb, line 13
def acts_like_time?
true
end
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 GitHub
# 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
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 GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 109
def ago(seconds)
since(-seconds)
end
Alias for:
beginning_of_day
.
Alias for:
beginning_of_hour
.
Alias for:
beginning_of_minute
.
Alias for:
end_of_day
.
Alias for:
end_of_hour
.
Alias for:
end_of_minute
.
Alias for:
middle_of_day
.
Alias for:
middle_of_day
.
Alias for:
beginning_of_day
.
Alias for:
middle_of_day
.
Also aliased as:
midnight
, at_midnight
, at_beginning_of_day
.
Returns a new DateTime
representing the start of the day (0:00).
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 122
def beginning_of_day
change(hour: 0)
end
Also aliased as:
at_beginning_of_hour
.
Returns a new DateTime
representing the start of the hour (hh:00:00).
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 146
def beginning_of_hour
change(min: 0)
end
Also aliased as:
at_beginning_of_minute
.
Returns a new DateTime
representing the start of the minute (hh:mm:00).
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 158
def beginning_of_minute
change(sec: 0)
end
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 GitHub
# 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
Alias for:
inspect
.
Also aliased as:
at_end_of_day
.
Returns a new DateTime
representing the end of the day (23:59:59).
Source code GitHub
# 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
Also aliased as:
at_end_of_hour
.
Returns a new DateTime
representing the end of the hour (hh:59:59).
Source code GitHub
# 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
Also aliased as:
at_end_of_minute
.
Returns a new DateTime
representing the end of the minute (hh:mm:59).
Source code GitHub
# 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
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 GitHub
# 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
Alias for:
utc
.
Alias for:
localtime
.
Alias for:
utc
.
Alias for:
utc
.
Alias for:
since
.
Also aliased as:
getlocal
.
Returns a Time
instance of the simultaneous time in the system timezone.
Source code GitHub
# 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
Alias for:
middle_of_day
.
Also aliased as:
midday
, noon
, at_midday
, at_noon
, at_middle_of_day
.
Returns a new DateTime
representing the middle of the day (12:00)
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 130
def middle_of_day
change(hour: 12)
end
Alias for:
beginning_of_day
.
Alias for:
middle_of_day
.
Returns the fraction of a second as nanoseconds
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 94
def nsec
(sec_fraction * 1_000_000_000).to_i
end
Also aliased as:
inspect
.
Overrides the default inspect method with a human readable one, e.g., “Mon, 21 Feb 2005 14:30:00 +0000”.
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 56
def readable_inspect
to_fs(:rfc822)
end
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 GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 20
def seconds_since_midnight
sec + (min * 60) + (hour * 3600)
end
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 GitHub
# 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
Also aliased as:
in
.
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!
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 116
def since(seconds)
self + Rational(seconds, 86400)
end
Returns the fraction of a second as a Rational
DateTime.new(2012, 8, 29, 0, 0, 0.5).subsec # => (1/2)
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 36
def subsec
sec_fraction
end
Converts self
to a floating-point number of seconds, including fractional microseconds, since the Unix epoch.
Source code GitHub
# 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
Alias for:
to_fs
.
Also aliased as:
to_formatted_s
.
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}") }
Source code GitHub
# 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
Converts self
to an integer number of seconds since the Unix epoch.
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 84
def to_i
seconds_since_unix_epoch.to_i
end
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 GitHub
# File activesupport/lib/active_support/core_ext/date_time/compatibility.rb, line 15
def to_time
preserve_timezone ? getlocal(utc_offset) : getlocal
end
Returns the fraction of a second as microseconds
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/conversions.rb, line 89
def usec
(sec_fraction * 1_000_000).to_i
end
Also aliased as:
getgm
, getutc
, gmtime
.
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
Source code GitHub
# 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
Returns true
if offset == 0
.
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 197
def utc?
offset == 0
end
Returns the offset value in seconds.
Source code GitHub
# File activesupport/lib/active_support/core_ext/date_time/calculations.rb, line 202
def utc_offset
(offset * 86400).to_i
end
Definition files
activesupport/
lib/ active_support/ core_ext/ date_time/ acts_like.rb activesupport/
lib/ active_support/ core_ext/ date_time/ blank.rb activesupport/
lib/ active_support/ core_ext/ date_time/ calculations.rb activesupport/
lib/ active_support/ core_ext/ date_time/ compatibility.rb activesupport/
lib/ active_support/ core_ext/ date_time/ conversions.rb activesupport/
lib/ active_support/ core_ext/ object/ json.rb