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 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
Returns Time.zone.now.to_datetime
when Time.zone
or config.time_zone
are set, otherwise returns
Time.now.to_datetime
.
# File 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
Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime.
# File lib/active_support/core_ext/date_time/calculations.rb, line 163 def <=>(other) if other.kind_of?(Infinity) super elsif other.respond_to? :to_datetime super other.to_datetime rescue nil else nil end end
Duck-types as a Date-like class. See Object#acts_like?.
# File lib/active_support/core_ext/date_time/acts_like.rb, line 6 def acts_like_date? true end
Duck-types as a Time-like class. See Object#acts_like?.
# File lib/active_support/core_ext/date_time/acts_like.rb, line 11 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
.
# File lib/active_support/core_ext/date_time/calculations.rb, line 55 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!
# File lib/active_support/core_ext/date_time/calculations.rb, line 82 def ago(seconds) since(-seconds) end
Returns a new DateTime representing the start of the day (0:00).
# File lib/active_support/core_ext/date_time/calculations.rb, line 95 def beginning_of_day change(:hour => 0) end
Returns a new DateTime representing the start of the hour (hh:00:00).
# File lib/active_support/core_ext/date_time/calculations.rb, line 119 def beginning_of_hour change(:min => 0) end
Returns a new DateTime representing the start of the minute (hh:mm:00).
# File lib/active_support/core_ext/date_time/calculations.rb, line 131 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)
# File 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
Returns a new DateTime representing the end of the day (23:59:59).
# File lib/active_support/core_ext/date_time/calculations.rb, line 113 def end_of_day change(:hour => 23, :min => 59, :sec => 59) end
Returns a new DateTime representing the end of the hour (hh:59:59).
# File lib/active_support/core_ext/date_time/calculations.rb, line 125 def end_of_hour change(:min => 59, :sec => 59) end
Returns a new DateTime representing the end of the minute (hh:mm:59).
# File lib/active_support/core_ext/date_time/calculations.rb, line 137 def end_of_minute change(:sec => 59) end
datetime = DateTime.civil(2000, 1, 1, 0, 0, 0, Rational(-6, 24)) datetime.formatted_offset # => “-06:00” datetime.formatted_offset(false) # => “-0600”
# File 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
Returns a new DateTime representing the middle of the day (12:00)
# File lib/active_support/core_ext/date_time/calculations.rb, line 103 def middle_of_day change(:hour => 12) end
Returns the fraction of a second as nanoseconds
# File lib/active_support/core_ext/date_time/conversions.rb, line 90 def nsec (sec_fraction * 1_000_000_000).to_i end
Overrides the default inspect method with a human readable one, e.g., “Mon, 21 Feb 2005 14:30:00 +0000”.
# File lib/active_support/core_ext/date_time/conversions.rb, line 52 def readable_inspect to_s(:rfc822) end
Seconds since midnight: DateTime.now.seconds_since_midnight.
# File lib/active_support/core_ext/date_time/calculations.rb, line 14 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
# File 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
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 lib/active_support/core_ext/date_time/calculations.rb, line 89 def since(seconds) self + Rational(seconds.round, 86400) end
Converts self
to a floating-point number of seconds, including
fractional microseconds, since the Unix epoch.
# File lib/active_support/core_ext/date_time/conversions.rb, line 75 def to_f seconds_since_unix_epoch.to_f + sec_fraction end
Convert to a formatted string. See Time::DATE_FORMATS for predefined formats.
This method is aliased to to_s
.
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"
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 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
Converts self
to an integer number of seconds since the Unix
epoch.
# File lib/active_support/core_ext/date_time/conversions.rb, line 80 def to_i seconds_since_unix_epoch.to_i end
Returns the fraction of a second as microseconds
# File lib/active_support/core_ext/date_time/conversions.rb, line 85 def usec (sec_fraction * 1_000_000).to_i end
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 lib/active_support/core_ext/date_time/calculations.rb, line 146 def utc new_offset(0) end
Returns true
if offset == 0
.
# File lib/active_support/core_ext/date_time/calculations.rb, line 152 def utc? offset == 0 end
Returns the offset value in seconds.
# File lib/active_support/core_ext/date_time/calculations.rb, line 157 def utc_offset (offset * 86400).to_i end
# File lib/active_support/core_ext/date_time/conversions.rb, line 96 def offset_in_seconds (offset * 86400).to_i end
# File lib/active_support/core_ext/date_time/conversions.rb, line 100 def seconds_since_unix_epoch (jd - 2440588) * 86400 - offset_in_seconds + seconds_since_midnight end