Class: DateTime
- Includes:
- DateAndTime::Zones
- Defined in:
- lib/active_support/core_ext/object/json.rb,
lib/active_support/core_ext/date_time/zones.rb,
lib/active_support/core_ext/date_time/acts_like.rb,
lib/active_support/core_ext/date_time/conversions.rb,
lib/active_support/core_ext/date_time/calculations.rb
Class Method Summary collapse
-
.civil_from_format(utc_or_local, year, month = 1, day = 1, hour = 0, min = 0, sec = 0) ⇒ Object
Returns DateTime with local offset for given year if format is local else offset is zero.
-
.current ⇒ Object
Returns
Time.zone.now.to_datetime
whenTime.zone
orconfig.time_zone
are set, otherwise returnsTime.now.to_datetime
.
Instance Method Summary collapse
-
#<=>(other) ⇒ Object
Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime.
-
#acts_like_date? ⇒ Boolean
Duck-types as a Date-like class.
-
#acts_like_time? ⇒ Boolean
Duck-types as a Time-like class.
-
#advance(options) ⇒ Object
Uses Date to provide precise Time calculations for years, months, and days.
-
#ago(seconds) ⇒ Object
Returns a new DateTime representing the time a number of seconds ago.
-
#as_json(options = nil) ⇒ Object
:nodoc:.
-
#beginning_of_day ⇒ Object
(also: #midnight, #at_midnight, #at_beginning_of_day)
Returns a new DateTime representing the start of the day (0:00).
-
#beginning_of_hour ⇒ Object
(also: #at_beginning_of_hour)
Returns a new DateTime representing the start of the hour (hh:00:00).
-
#beginning_of_minute ⇒ Object
(also: #at_beginning_of_minute)
Returns a new DateTime representing the start of the minute (hh:mm:00).
-
#change(options) ⇒ Object
Returns a new DateTime where one or more of the elements have been changed according to the
options
parameter. -
#end_of_day ⇒ Object
(also: #at_end_of_day)
Returns a new DateTime representing the end of the day (23:59:59).
-
#end_of_hour ⇒ Object
(also: #at_end_of_hour)
Returns a new DateTime representing the end of the hour (hh:59:59).
-
#end_of_minute ⇒ Object
(also: #at_end_of_minute)
Returns a new DateTime representing the end of the minute (hh:mm:59).
-
#formatted_offset(colon = true, alternate_utc_string = nil) ⇒ Object
datetime = DateTime.civil(2000, 1, 1, 0, 0, 0, Rational(-6, 24)) datetime.formatted_offset # => “-06:00” datetime.formatted_offset(false) # => “-0600”.
-
#middle_of_day ⇒ Object
(also: #midday, #noon, #at_midday, #at_noon, #at_middle_of_day)
Returns a new DateTime representing the middle of the day (12:00).
-
#nsec ⇒ Object
Returns the fraction of a second as nanoseconds.
-
#readable_inspect ⇒ Object
(also: #inspect)
Overrides the default inspect method with a human readable one, e.g., “Mon, 21 Feb 2005 14:30:00 +0000”.
-
#seconds_since_midnight ⇒ Object
Seconds since midnight: DateTime.now.seconds_since_midnight.
-
#seconds_until_end_of_day ⇒ Object
Returns the number of seconds until 23:59:59.
-
#since(seconds) ⇒ Object
(also: #in)
Returns a new DateTime representing the time a number of seconds since the instance time.
-
#to_f ⇒ Object
Converts
self
to a floating-point number of seconds, including fractional microseconds, since the Unix epoch. -
#to_formatted_s(format = :default) ⇒ Object
(also: #to_s)
Convert to a formatted string.
-
#to_i ⇒ Object
Converts
self
to an integer number of seconds since the Unix epoch. -
#usec ⇒ Object
Returns the fraction of a second as microseconds.
-
#utc ⇒ Object
(also: #getutc)
Adjusts DateTime to UTC by adding its offset value; offset is set to 0.
-
#utc? ⇒ Boolean
Returns
true
ifoffset == 0
. -
#utc_offset ⇒ Object
Returns the offset value in seconds.
Methods included from DateAndTime::Zones
Class Method Details
.civil_from_format(utc_or_local, year, month = 1, day = 1, hour = 0, min = 0, sec = 0) ⇒ Object
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# 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 |
Instance Method Details
#<=>(other) ⇒ Object
Layers additional behavior on DateTime#<=> so that Time and ActiveSupport::TimeWithZone instances can be compared with a DateTime.
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# 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 |
#acts_like_date? ⇒ Boolean
Duck-types as a Date-like class. See Object#acts_like?.
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# File 'lib/active_support/core_ext/date_time/acts_like.rb', line 6 def acts_like_date? true end |
#acts_like_time? ⇒ Boolean
Duck-types as a Time-like class. See Object#acts_like?.
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# File 'lib/active_support/core_ext/date_time/acts_like.rb', line 11 def acts_like_time? true end |
#advance(options) ⇒ Object
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
.
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 55 def advance() unless [:weeks].nil? [:weeks], partial_weeks = [:weeks].divmod(1) [:days] = .fetch(:days, 0) + 7 * partial_weeks end unless [:days].nil? [:days], partial_days = [:days].divmod(1) [:hours] = .fetch(:hours, 0) + 24 * partial_days end d = to_date.advance() datetime_advanced_by_date = change(:year => d.year, :month => d.month, :day => d.day) seconds_to_advance = \ .fetch(:seconds, 0) + .fetch(:minutes, 0) * 60 + .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) ⇒ Object
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!
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 82 def ago(seconds) since(-seconds) end |
#as_json(options = nil) ⇒ Object
:nodoc:
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# File 'lib/active_support/core_ext/object/json.rb', line 184 def as_json( = nil) #:nodoc: if ActiveSupport::JSON::Encoding.use_standard_json_time_format xmlschema(ActiveSupport::JSON::Encoding.time_precision) else strftime('%Y/%m/%d %H:%M:%S %z') end end |
#beginning_of_day ⇒ Object Also known as: midnight, at_midnight, at_beginning_of_day
Returns a new DateTime representing the start of the day (0:00).
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 95 def beginning_of_day change(:hour => 0) end |
#beginning_of_hour ⇒ Object Also known as: at_beginning_of_hour
Returns a new DateTime representing the start of the hour (hh:00:00).
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 119 def beginning_of_hour change(:min => 0) end |
#beginning_of_minute ⇒ Object Also known as: at_beginning_of_minute
Returns a new DateTime representing the start of the minute (hh:mm:00).
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 131 def beginning_of_minute change(:sec => 0) end |
#change(options) ⇒ Object
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)
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 38 def change() ::DateTime.civil( .fetch(:year, year), .fetch(:month, month), .fetch(:day, day), .fetch(:hour, hour), .fetch(:min, [:hour] ? 0 : min), .fetch(:sec, ([:hour] || [:min]) ? 0 : sec + sec_fraction), .fetch(:offset, offset), .fetch(:start, start) ) end |
#end_of_day ⇒ Object Also known as: at_end_of_day
Returns a new DateTime representing the end of the day (23:59:59).
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 113 def end_of_day change(:hour => 23, :min => 59, :sec => 59) end |
#end_of_hour ⇒ Object Also known as: at_end_of_hour
Returns a new DateTime representing the end of the hour (hh:59:59).
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 125 def end_of_hour change(:min => 59, :sec => 59) end |
#end_of_minute ⇒ Object Also known as: at_end_of_minute
Returns a new DateTime representing the end of the minute (hh:mm:59).
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 137 def end_of_minute change(:sec => 59) end |
#formatted_offset(colon = true, alternate_utc_string = nil) ⇒ Object
datetime = DateTime.civil(2000, 1, 1, 0, 0, 0, Rational(-6, 24))
datetime.formatted_offset # => "-06:00"
datetime.formatted_offset(false) # => "-0600"
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# 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 |
#middle_of_day ⇒ Object Also known as: midday, noon, at_midday, at_noon, at_middle_of_day
Returns a new DateTime representing the middle of the day (12:00)
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 103 def middle_of_day change(:hour => 12) end |
#nsec ⇒ Object
Returns the fraction of a second as nanoseconds
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# File 'lib/active_support/core_ext/date_time/conversions.rb', line 90 def nsec (sec_fraction * 1_000_000_000).to_i end |
#readable_inspect ⇒ Object Also known as: inspect
Overrides the default inspect method with a human readable one, e.g., “Mon, 21 Feb 2005 14:30:00 +0000”.
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# File 'lib/active_support/core_ext/date_time/conversions.rb', line 52 def readable_inspect to_s(:rfc822) end |
#seconds_since_midnight ⇒ Object
Seconds since midnight: DateTime.now.seconds_since_midnight.
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# File '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 ⇒ Object
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# 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 |
#since(seconds) ⇒ Object Also known 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!
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 89 def since(seconds) self + Rational(seconds.round, 86400) end |
#to_f ⇒ Object
Converts self
to a floating-point number of seconds, including fractional microseconds, since the Unix epoch.
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# File 'lib/active_support/core_ext/date_time/conversions.rb', line 75 def to_f seconds_since_unix_epoch.to_f + sec_fraction end |
#to_formatted_s(format = :default) ⇒ Object Also known as: to_s
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}") }
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# 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 |
#to_i ⇒ Object
Converts self
to an integer number of seconds since the Unix epoch.
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# File 'lib/active_support/core_ext/date_time/conversions.rb', line 80 def to_i seconds_since_unix_epoch.to_i end |
#usec ⇒ Object
Returns the fraction of a second as microseconds
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# File 'lib/active_support/core_ext/date_time/conversions.rb', line 85 def usec (sec_fraction * 1_000_000).to_i end |
#utc ⇒ Object Also known as: getutc
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 146 def utc new_offset(0) end |
#utc? ⇒ Boolean
Returns true
if offset == 0
.
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 152 def utc? offset == 0 end |
#utc_offset ⇒ Object
Returns the offset value in seconds.
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# File 'lib/active_support/core_ext/date_time/calculations.rb', line 157 def utc_offset (offset * 86400).to_i end |