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- usec,
- utc,
- utc?,
- utc_offset
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 67 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.
Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime.
Duck-types as a Date-like class. See Object#acts_like?.
Duck-types as a Time-like class. See Object#acts_like?.
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 76 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!
Returns a new DateTime representing the start of the hour (hh:00:00).
Returns a new DateTime representing the start of the minute (hh:mm:00).
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 49 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
Returns a new DateTime representing the end of the day (23:59:59).
Returns a new DateTime representing the end of the hour (hh:59:59).
Returns a new DateTime representing the end of the minute (hh:mm:59).
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"
Returns a Time instance of the simultaneous time in the system
timezone.
Returns the fraction of a second as nanoseconds
Overrides the default inspect method with a human readable one, e.g., “Mon, 21 Feb 2005 14:30:00 +0000”.
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
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
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!
Returns the fraction of a second as a Rational
DateTime.new(2012, 8, 29, 0, 0, 0.5).subsec # => (1/2)
Converts self to a floating-point number of seconds, including
fractional microseconds, since the Unix epoch.
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}") }
Converts self to an integer number of seconds since the Unix
epoch.
Either return an instance of `Time` with the same UTC offset as
self or an instance of `Time` representing the same time in
the the local system timezone depending on the setting of on the setting of
ActiveSupport.to_time_preserves_timezone.
Returns the fraction of a second as microseconds
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
Returns true if offset == 0.