note
	description: "Absolute temporal values composed of a date and a time"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2017-03-29 12:26:46 +0000 (Wed, 29 Mar 2017) $"
	revision: "$Revision: 100065 $"
	access: date, time
	eis: "name=Obtaining a DATE from a DATE_TIME and vice versa", "src=$(ISE_DOC_UUID)/195849fc-1a9c-d734-2d2b-acae78133886#Obtaining_a_DATE_from_a_DATE_TIME_and_vice_versa", "tag=EiffelTime"
	eis: "name=DATE / TIME to STRING Conversion", "src=$(ISE_DOC_UUID)/88972ba4-694b-8558-b0c8-87b1fc40afc4", "tag=EiffelTime"

class 
	DATE_TIME

create 
	make,
	make_fine,
	make_by_date_time,
	make_by_date,
	make_now,
	make_now_utc,
	make_from_epoch,
	make_from_string,
	make_from_string_with_base,
	make_from_string_default,
	make_from_string_default_with_base

feature -- Initialization

	make (y, mo, d, h, mi, s: INTEGER_32)
			-- Set year, month day to y, mo, d.
			-- Set hour, minute, second to h, mi, s.
		require
			correct_date_time: is_correct_date_time (y, mo, d, h, mi, s.to_double, False)
		do
			create date.make (y, mo, d)
			create time.make (h, mi, s)
		ensure
			year_set: year = y
			month_set: month = mo
			day_set: day = d
			hour_set: hour = h
			minute_set: minute = mi
			second_set: second = s
		end

	make_by_date (d: DATE)
			-- Set date to d and time to origin of time.
		require
			d_exists: d /= Void
		do
			date := d
			create time.make (0, 0, 0)
		ensure
			date_set: date = d
			time_set: time.is_equal (time.Origin)
		end

	make_by_date_time (d: DATE; t: TIME)
			-- Set date to d and time to t
		require
			d_exists: d /= Void
			t_exists: t /= Void
		do
			date := d
			time := t
		ensure
			date_set: date = d
			time_set: time = t
		end

	make_fine (y, mo, d, h, mi: INTEGER_32; s: REAL_64)
			-- Set year, month day to y, mo, d.
			-- Set hour, minute, second to h, m, s.
		require
			correct_date_time: is_correct_date_time (y, mo, d, h, mi, s, False)
		do
			create date.make (y, mo, d)
			create time.make_fine (h, mi, s)
		ensure
			year_set: year = y
			month_set: month = mo
			day_set: day = d
			hour_set: hour = h
			minute_set: minute = mi
			second_set: fine_second = s
		end

	make_from_epoch (s: INTEGER_32)
			-- Create a new date time from the number of
			-- seconds since epoch (1 Jan 1970 at 00:00:00).
		local
			d: INTEGER_32
			ss: INTEGER_32
			l_dur: DATE_TIME_DURATION
		do
			if s < 0 then
				ss := - s
			else
				ss := s
			end
			d := ss // Seconds_in_day
			ss := ss \\ Seconds_in_day
			create l_dur.make_definite (d, 0, 0, ss)
			make_fine (1970, 1, 1, 0, 0, 0.0)
			if s < 0 then
				add (- l_dur)
			else
				add (l_dur)
			end
		end

	make_from_string (s: STRING_8; code: STRING_8)
			-- Initialize from a "standard" string of form
			-- code.
			-- (For 2-digit year specifications, the current century is used as
			-- base century.)
		require
			s_exists: s /= Void
			c_exists: code /= Void
			date_time_valid: date_time_valid (s, code)
		local
			date_time: DATE_TIME
		do
			date_time := (create {DATE_TIME_CODE_STRING}.make (code)).create_date_time (s)
			make_by_date_time (date_time.date, date_time.time)
		end

	make_from_string_default (s: STRING_8)
			-- Initialize from a "standard" string of form
			-- default_format_string.
			-- (For 2-digit year specifications, the current century is used as
			-- base century.)
		require
			s_exists: s /= Void
			date_time_valid: date_time_valid (s, default_format_string)
		do
			make_from_string (s, default_format_string)
		end

	make_from_string_default_with_base (s: STRING_8; base: INTEGER_32)
			-- Initialize from a "standard" string of form
			-- default_format_string with base century base.
		require
			s_exists: s /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
			date_time_valid: date_time_valid_with_base (s, default_format_string, base)
		do
			make_from_string_with_base (s, default_format_string, base)
		end

	make_from_string_with_base (s: STRING_8; code: STRING_8; base: INTEGER_32)
			-- Initialize from a "standard" string of form
			-- code with base century base.
		require
			s_exists: s /= Void
			c_exists: code /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
			date_time_valid: date_time_valid_with_base (s, code, base)
		local
			code_string: DATE_TIME_CODE_STRING
			date_time: DATE_TIME
		do
			create code_string.make (code)
			code_string.set_base_century (base)
			date_time := code_string.create_date_time (s)
			make_by_date_time (date_time.date, date_time.time)
		end

	make_now
			-- Get the date and the time from the system.
		local
			l_date: C_DATE
		do
			create l_date
			create date.make (l_date.year_now, l_date.month_now, l_date.day_now)
			create time.make_fine (l_date.hour_now, l_date.minute_now, l_date.second_now.to_double + l_date.millisecond_now / 1000)
		end

	make_now_utc
			-- Get the date and the time from the system.
		local
			l_date: C_DATE
		do
			create l_date.make_utc
			create date.make (l_date.year_now, l_date.month_now, l_date.day_now)
			create time.make_fine (l_date.hour_now, l_date.minute_now, l_date.second_now.to_double + l_date.millisecond_now / 1000)
		end
	
feature {NONE} -- Initialization

	default_create
			-- Process instances of classes with no creation clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end
	
feature -- Access

	date: DATE
			-- Date of the current object

	date_default_format_string: STRING_8
			-- Default output format for dates
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Date_default_format_string
		end

	date_duration: DATE_DURATION
			-- Definite duration between origin of date and current date
		do
			Result := date.duration
		end

	Date_time_tools: DATE_TIME_TOOLS
			-- Tools for outputting dates and times in different formats
			-- (from TIME_UTILITY)
		once
			create Result
		end

	day: INTEGER_32
			-- Day of the current object
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  DATE_MEASUREMENT
			True
		do
			Result := date.day
		ensure -- from DATE_TIME_MEASUREMENT
			same_day: Result = date.day
		end

	days: INTEGER_32
			-- Number of days elapsed since Origin
		do
			Result := date.days
		end

	days_in_i_th_month (i, y: INTEGER_32): INTEGER_32
			-- Number of days in the i th month at year y
			-- (from DATE_CONSTANTS)
		require -- from DATE_CONSTANTS
			i_large_enough: i >= 1
			i_small_enough: i <= Months_in_year
		do
			Result := Days_in_months @ i
			if i = 2 and then is_leap_year (y) then
				Result := Result + 1
			end
		end

	Days_in_leap_year: INTEGER_32 = 366
			-- Number of days in a leap year
			-- (from DATE_CONSTANTS)

	Days_in_non_leap_year: INTEGER_32 = 365
			-- Number of days in a non-leap year
			-- (from DATE_CONSTANTS)

	Days_in_week: INTEGER_32 = 7
			-- Number of days in a week
			-- (from DATE_CONSTANTS)

	days_text: ARRAY [STRING_8]
			-- Short text representation of days
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Days_text
		end

	default_format_string: STRING_8
			-- Default output format string
			-- (from TIME_UTILITY)
		do
			Result := Date_time_tools.Default_format_string
		end

	fine_second: REAL_64
			-- Representation of second with decimals
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  TIME_MEASUREMENT
			True
		do
			Result := time.fine_second
		ensure -- from DATE_TIME_MEASUREMENT
			same_fine_second: Result = time.fine_second
		end

	fractional_second: REAL_64
			-- Fractional part of fine_second
			-- (from TIME_VALUE)

	generating_type: TYPE [detachable DATE_TIME]
			-- Type of current object
			-- (type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generating_type_not_void: Result /= Void
		end

	generator: STRING_8
			-- Name of current object's generating class
			-- (base class of the type of which it is a direct instance)
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			generator_not_void: Result /= Void
			generator_not_empty: not Result.is_empty
		end

	hour: INTEGER_32
			-- Hour of the current object
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  TIME_MEASUREMENT
			True
		do
			Result := time.hour
		ensure -- from DATE_TIME_MEASUREMENT
			same_hour: Result = time.hour
		end

	Hours_in_day: INTEGER_32 = 24
			-- Number of hours in a day
			-- (from TIME_CONSTANTS)

	long_days_text: ARRAY [STRING_8]
			-- Long text representation of days
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Long_days_text
		end

	long_months_text: ARRAY [STRING_8]
			-- Long text representation of months
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Long_months_text
		end

	Max_weeks_in_year: INTEGER_32 = 53
			-- Maximun number of weeks in a year
			-- (from DATE_CONSTANTS)

	minute: INTEGER_32
			-- Minute of the current object
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  TIME_MEASUREMENT
			True
		do
			Result := time.minute
		ensure -- from DATE_TIME_MEASUREMENT
			same_minute: Result = time.minute
		end

	Minutes_in_hour: INTEGER_32 = 60
			-- Number of minutes in an hour
			-- (from TIME_CONSTANTS)

	month: INTEGER_32
			-- Month of the current object
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  DATE_MEASUREMENT
			True
		do
			Result := date.month
		ensure -- from DATE_TIME_MEASUREMENT
			same_month: Result = date.month
		end

	Months_in_year: INTEGER_32 = 12
			-- Number of months in year
			-- (from DATE_CONSTANTS)

	months_text: ARRAY [STRING_8]
			-- Short text representation of months
			-- (from DATE_CONSTANTS)
		do
			Result := Date_time_tools.Months_text
		end

	Origin: DATE_TIME
			-- Origin date with origin time
		once
			create Result.make_by_date_time (date.Origin, time.Origin)
		ensure -- from ABSOLUTE
			result_exists: Result /= Void
		end

	second: INTEGER_32
			-- Second of the current object
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  TIME_MEASUREMENT
			True
		do
			Result := time.second
		ensure -- from DATE_TIME_MEASUREMENT
			same_second: Result = time.second
		end

	seconds: INTEGER_32
			-- Number of seconds elapsed from midnight of the current date
		do
			Result := time.seconds
		end

	Seconds_in_day: INTEGER_32 = 86400
			-- Number of seconds in an hour
			-- (from TIME_CONSTANTS)

	Seconds_in_hour: INTEGER_32 = 3600
			-- Number of seconds in an hour
			-- (from TIME_CONSTANTS)

	Seconds_in_minute: INTEGER_32 = 60
			-- Number of seconds in a minute
			-- (from TIME_CONSTANTS)

	time: TIME
			-- Time of the current object

	time_default_format_string: STRING_8
			-- Default output format for times
			-- (from TIME_CONSTANTS)
		do
			Result := Date_time_tools.Time_default_format_string
		end

	time_duration: TIME_DURATION
			-- Duration elapsed from midnight of the current date
		do
			Result := time.duration
		end

	year: INTEGER_32
			-- Year of the current object
			-- (from DATE_TIME_MEASUREMENT)
		require -- from  DATE_MEASUREMENT
			True
		do
			Result := date.year
		ensure -- from DATE_TIME_MEASUREMENT
			same_year: Result = date.year
		end
	
feature {NONE} -- Access

	compact_date: INTEGER_32
		obsolete "Use `ordered_compact_date' instead. But be careful in your update since `compact_date' and `ordered_compact_date' do not have the same encoding. [2017-05-31]"
			-- Day, month and year coded.
			-- (from DATE_VALUE)
		do
			Result := year | (month |<< 16) | (day |<< 24)
		end

	compact_time: INTEGER_32
			-- Hour, minute, second coded.
			-- (from TIME_VALUE)

	micro_second: INTEGER_32
			-- Microsecond of the current time
			-- (from TIME_VALUE)
		do
			Result := (fractional_second * 1000000.to_double).truncated_to_integer
			Result := Result \\ 1000
		end

	milli_second: INTEGER_32
			-- Millisecond of the current time
			-- (from TIME_VALUE)
		do
			Result := (fractional_second * 1000.to_double).truncated_to_integer
		end

	nano_second: INTEGER_32
			-- Nanosecond of the current time
			-- (from TIME_VALUE)
		do
			Result := (fractional_second * 1000000000.to_double).truncated_to_integer
			Result := Result \\ 1000
		end

	ordered_compact_date: INTEGER_32
			-- Year, month, day coded for fast comparison between dates.
			-- (from DATE_VALUE)
	
feature -- Measurement

	duration: DATE_TIME_DURATION
			-- Definite duration elapsed from Origin
		require -- from  ABSOLUTE
			True
		do
			create Result.make_by_date_time (date_duration, time_duration)
		ensure then
			definite_result: Result.definite
		end
	
feature -- Comparison

	frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void
			-- or attached to isomorphic object structures?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_deep_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			shallow_implies_deep: standard_equal (a, b) implies Result
			both_or_none_void: (a = Void) implies (Result = (b = Void))
			same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b))
			symmetric: Result implies deep_equal (b, a)
		end

	frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached
			-- to objects considered equal?
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b))
		end

	frozen is_deep_equal (other: DATE_TIME): BOOLEAN
			-- Are Current and other attached to isomorphic object structures?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			shallow_implies_deep: standard_is_equal (other) implies Result
			same_type: Result implies same_type (other)
			symmetric: Result implies other.is_deep_equal (Current)
		end

	is_equal (other: like Current): BOOLEAN
			-- Is the current object equal to other?
		require -- from ANY
			other_not_void: other /= Void
		do
			Result := equal (date, other.date) and then equal (time, other.time)
		ensure -- from ANY
			symmetric: Result implies other ~ Current
			consistent: standard_is_equal (other) implies Result
		ensure then -- from COMPARABLE
			trichotomy: Result = (not (Current < other) and not (other < Current))
		end

	is_greater alias ">" (other: DATE_TIME): BOOLEAN
			-- Is current object greater than other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := other < Current
		ensure then -- from COMPARABLE
			definition: Result = (other < Current)
		end

	is_greater_equal alias ">=" (other: DATE_TIME): BOOLEAN
			-- Is current object greater than or equal to other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := not (Current < other)
		ensure then -- from COMPARABLE
			definition: Result = (other <= Current)
		end

	is_less alias "<" (other: like Current): BOOLEAN
			-- Is the current object before other?
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := date < other.date or else (date.is_equal (other.date) and then (time < other.time))
		ensure then -- from COMPARABLE
			asymmetric: Result implies not (other < Current)
		end

	is_less_equal alias "<=" (other: DATE_TIME): BOOLEAN
			-- Is current object less than or equal to other?
			-- (from COMPARABLE)
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		do
			Result := not (other < Current)
		ensure then -- from COMPARABLE
			definition: Result = ((Current < other) or (Current ~ other))
		end

	max (other: DATE_TIME): DATE_TIME
			-- The greater of current object and other
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current >= other then
				Result := Current
			else
				Result := other
			end
		ensure -- from COMPARABLE
			current_if_not_smaller: Current >= other implies Result = Current
			other_if_smaller: Current < other implies Result = other
		end

	min (other: DATE_TIME): DATE_TIME
			-- The smaller of current object and other
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current <= other then
				Result := Current
			else
				Result := other
			end
		ensure -- from COMPARABLE
			current_if_not_greater: Current <= other implies Result = Current
			other_if_greater: Current > other implies Result = other
		end

	frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN
			-- Are a and b either both void or attached to
			-- field-by-field identical objects of the same type?
			-- Always uses default object comparison criterion.
			-- (from ANY)
		do
			if a = Void then
				Result := b = Void
			else
				Result := b /= Void and then a.standard_is_equal (b)
			end
		ensure -- from ANY
			instance_free: class
			definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b))
		end

	frozen standard_is_equal (other: DATE_TIME): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object, and field-by-field identical to it?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			same_type: Result implies same_type (other)
			symmetric: Result implies other.standard_is_equal (Current)
		end

	three_way_comparison (other: DATE_TIME): INTEGER_32
			-- If current object equal to other, 0;
			-- if smaller, -1; if greater, 1
			-- (from COMPARABLE)
		require -- from COMPARABLE
			other_exists: other /= Void
		do
			if Current < other then
				Result := -1
			elseif other < Current then
				Result := 1
			end
		ensure -- from COMPARABLE
			equal_zero: (Result = 0) = (Current ~ other)
			smaller_negative: (Result = -1) = (Current < other)
			greater_positive: (Result = 1) = (Current > other)
		end
	
feature -- Status report

	conforms_to (other: ANY): BOOLEAN
			-- Does type of current object conform to type
			-- of other (as per Eiffel: The Language, chapter 13)?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		end

	i_th_leap_year (i: INTEGER_32): BOOLEAN
		obsolete "Use `is_leap_year' instead. [2017-05-31]"
			-- (from DATE_CONSTANTS)
		do
			Result := is_leap_year (i)
		end

	is_leap_year (y: INTEGER_32): BOOLEAN
			-- Is year y a leap year?
			-- (from DATE_CONSTANTS)
		do
			Result := (mod (y, 4) = 0) and ((mod (y, 100) /= 0) or (mod (y, 400) = 0))
		end

	same_type (other: ANY): BOOLEAN
			-- Is type of current object identical to type of other?
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		external
			"built_in"
		ensure -- from ANY
			definition: Result = (conforms_to (other) and other.conforms_to (Current))
		end
	
feature {NONE} -- Element change

	set_compact_date (y, m, d: INTEGER_32)
			-- Set year with y, month with m and day with d.
			-- (from DATE_VALUE)
		require -- from DATE_MEASUREMENT
			d_large_enough: d >= 1
			m_large_enough: m >= 1
			m_small_enough: m <= Months_in_year
			d_small_enough: d <= days_in_i_th_month (m, y)
		local
			l_date: like ordered_compact_date
		do
			l_date := l_date & Day_mask.bit_not
			l_date := l_date | d
			l_date := l_date & Month_mask.bit_not
			l_date := l_date | (m |<< Month_shift)
			l_date := l_date & Year_mask.bit_not
			l_date := l_date | (y |<< Year_shift)
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			day_set: day = d
			month_set: month = m
			year_set: year = y
		end

	set_day (d: INTEGER_32)
			-- Set day to d.
			-- (from DATE_VALUE)
		require -- from DATE_MEASUREMENT
			d_large_enough: d >= 1
			d_small_enough: d <= days_in_month
		local
			l_date: like ordered_compact_date
		do
			l_date := ordered_compact_date
			l_date := l_date & Day_mask.bit_not
			l_date := l_date | d
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			day_set: day = d
		end

	set_fine_second (s: REAL_64)
			-- Set fine_second to s
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			s_large_enough: s >= 0.to_double
			s_small_enough: s < Seconds_in_minute.to_double
		local
			s_tmp: INTEGER_32
		do
			s_tmp := s.truncated_to_integer
			set_second (s_tmp)
			fractional_second := s - s_tmp.to_double
		ensure -- from TIME_MEASUREMENT
			fine_second_set: fine_second = s
		end

	set_fractionals (f: REAL_64)
			-- Set fractional_second to f.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			f_large_enough: f >= 0.to_double
			f_small_enough: f < 1.to_double
		do
			fractional_second := f
		ensure -- from TIME_MEASUREMENT
			second_same: second = old second
		end

	set_hour (h: INTEGER_32)
			-- Set hour to h.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			h_large_enough: h >= 0
			h_small_enough: h < Hours_in_day
		do
			compact_time := compact_time & Hour_mask.bit_not
			compact_time := compact_time | (h |<< Hour_shift)
		ensure -- from TIME_MEASUREMENT
			hour_set: hour = h
		end

	set_internal_compact_date (a_compact_date: like compact_date)
		obsolete "Use `ordered_compact_date' instead. But be careful in your update since `compact_date' and `ordered_compact_date' do not have the same encoding. [2017-05-31]"
			-- Set a_compact_date to compact_date.
			-- (from DATE_VALUE)
		do
			set_private_internal_compact_date (a_compact_date)
		ensure -- from DATE_VALUE
			compact_date_set: year | (month |<< 16) | (day |<< 24) = a_compact_date
		end

	set_internal_ordered_compact_date (a_ordered_compact_date: like ordered_compact_date)
			-- Set a_ordered_compact_date to ordered_compact_date.
			-- (from DATE_VALUE)
		do
			ordered_compact_date := a_ordered_compact_date
		ensure -- from DATE_VALUE
			ordered_compact_date_set: ordered_compact_date = a_ordered_compact_date
		end

	set_minute (m: INTEGER_32)
			-- Set minute to m.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			m_large_enough: m >= 0
			m_small_enough: m < Minutes_in_hour
		do
			compact_time := compact_time & Minute_mask.bit_not
			compact_time := compact_time | (m |<< Minute_shift)
		ensure -- from TIME_MEASUREMENT
			minute_set: minute = m
		end

	set_month (m: INTEGER_32)
			-- Set month to m.
			-- (from DATE_VALUE)
		require -- from DATE_MEASUREMENT
			m_large_enough: m >= 1
			m_small_enough: m <= Months_in_year
			d_small_enough: day <= days_in_i_th_month (m, year)
		local
			l_date: like ordered_compact_date
		do
			l_date := ordered_compact_date
			l_date := l_date & Month_mask.bit_not
			l_date := l_date | (m |<< Month_shift)
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			month_set: month = m
		end

	set_second (s: INTEGER_32)
			-- Set second to s.
			-- (from TIME_VALUE)
		require -- from TIME_MEASUREMENT
			s_large_enough: s >= 0
			s_small_enough: s < Seconds_in_minute
		do
			compact_time := compact_time & Second_mask.bit_not
			compact_time := compact_time | s
		ensure -- from TIME_MEASUREMENT
			second_set: second = s
		end

	set_year (y: INTEGER_32)
			-- Set year to y.
			-- (from DATE_VALUE)
		require -- from DATE_MEASUREMENT
			can_not_cut_29th_feb: day <= days_in_i_th_month (month, y)
		local
			l_date: like ordered_compact_date
		do
			l_date := ordered_compact_date
			l_date := l_date & Year_mask.bit_not
			l_date := l_date | (y |<< Year_shift)
			ordered_compact_date := l_date
		ensure -- from DATE_MEASUREMENT
			year_set: year = y
		end
	
feature -- Duplication

	frozen clone (other: detachable ANY): like other
		obsolete "Use `twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- equal to other
			--
			-- For non-void other, clone calls copy;
			-- to change copying/cloning semantics, redefine copy.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.twin
			end
		ensure -- from ANY
			instance_free: class
			equal: Result ~ other
		end

	frozen deep_clone (other: detachable ANY): like other
		obsolete "Use `deep_twin' instead. [2017-05-31]"
			-- Void if other is void: otherwise, new object structure
			-- recursively duplicated from the one attached to other
			-- (from ANY)
		do
			if other /= Void then
				Result := other.deep_twin
			end
		ensure -- from ANY
			instance_free: class
			deep_equal: deep_equal (other, Result)
		end

	frozen deep_copy (other: DATE_TIME)
			-- Effect equivalent to that of:
			--		copy (other . deep_twin)
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
		do
			copy (other.deep_twin)
		ensure -- from ANY
			deep_equal: deep_equal (Current, other)
		end

	frozen deep_twin: DATE_TIME
			-- New object structure recursively duplicated from Current.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			deep_twin_not_void: Result /= Void
			deep_equal: deep_equal (Current, Result)
		end

	frozen standard_clone (other: detachable ANY): like other
		obsolete "Use `standard_twin' instead. [2017-05-31]"
			-- Void if other is void; otherwise new object
			-- field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		do
			if other /= Void then
				Result := other.standard_twin
			end
		ensure -- from ANY
			instance_free: class
			equal: standard_equal (Result, other)
		end

	frozen standard_copy (other: DATE_TIME)
			-- Copy every field of other onto corresponding field
			-- of current object.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_standard_equal: standard_is_equal (other)
		end

	frozen standard_twin: DATE_TIME
			-- New object field-by-field identical to other.
			-- Always uses default copying semantics.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			standard_twin_not_void: Result /= Void
			equal: standard_equal (Result, Current)
		end

	frozen twin: DATE_TIME
			-- New object equal to Current
			-- twin calls copy; to change copying/twinning semantics, redefine copy.
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			twin_not_void: Result /= Void
			is_equal: Result ~ Current
		end
	
feature -- Basic operations

	add (dtd: DATE_TIME_DURATION)
			-- Adds dtd to current duration
		require
			dtd_not_void: dtd /= Void
		do
			if dtd.definite then
				day_add (dtd.day)
			else
				date.year_month_add (dtd.year, dtd.month)
				day_add (dtd.day)
			end
			day_add ((dtd.time + time_duration).to_days)
			time := time.Origin + (dtd.time + time_duration).time_modulo_day
		end

	frozen as_attached: attached DATE_TIME
		obsolete "Remove calls to this feature. [2017-05-31]"
			-- Attached version of Current.
			-- (Can be used during transitional period to convert
			-- non-void-safe classes to void-safe ones.)
			-- (from ANY)
		do
			Result := Current
		end

	day_add (d: INTEGER_32)
			-- Add d days to the current date.
		do
			date.make_by_days (days + d)
		ensure
			days_set: days = old days + d
		end

	frozen default: detachable DATE_TIME
			-- Default value of object's type
			-- (from ANY)
		do
		end

	frozen default_pointer: POINTER
			-- Default value of type POINTER
			-- (Avoid the need to write p.default for
			-- some p of type POINTER.)
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	default_rescue
			-- Process exception for routines with no Rescue clause.
			-- (Default: do nothing.)
			-- (from ANY)
		do
		end

	definite_duration (other: like Current): DATE_TIME_DURATION
			-- Duration from other to the current date, converted to a
			-- definite duration
		require
			other_exists: other /= Void
		do
			Result := relative_duration (other)
			Result.date.to_definite (other.date)
		ensure
			definite_result: Result.definite
		end

	frozen do_nothing
			-- Execute a null action.
			-- (from ANY)
		do
		ensure -- from ANY
			instance_free: class
		end

	fine_second_add (s: REAL_64)
			-- Add s seconds to the current object.
			-- if s has decimals, fractional_second from time is modified.
		local
			total_second: REAL_64
		do
			total_second := time.fine_second + s
			if total_second < 0.to_double or else total_second >= Seconds_in_minute.to_double then
				time.set_fine_second (total_second - div (total_second.floor, Seconds_in_minute) * Seconds_in_minute.to_double)
				minute_add (div (total_second.floor, Seconds_in_minute))
			else
				time.set_fine_second (total_second)
			end
		end

	hour_add (h: INTEGER_32)
			-- Add h hours to the current time.
		local
			total_hour: INTEGER_32
		do
			total_hour := hour + h
			if total_hour < 0 or else total_hour >= Hours_in_day then
				time.set_hour (mod (total_hour, Hours_in_day))
				day_add (div (total_hour, Hours_in_day))
			else
				time.set_hour (total_hour)
			end
		end

	minus alias "-" (other: DATE_TIME): INTERVAL [DATE_TIME]
			-- Interval between current object and other.
			-- (from ABSOLUTE)
		require -- from ABSOLUTE
			other_exists: other /= Void
			other_smaller_than_current: other <= Current
		do
			create Result.make (other, Current)
		ensure -- from ABSOLUTE
			result_exists: Result /= Void
			result_set: Result.start_bound.is_equal (other) and then Result.end_bound.is_equal (Current)
		end

	minute_add (m: INTEGER_32)
			-- Add m minutes to the current time.
		local
			total_minute: INTEGER_32
		do
			total_minute := minute + m
			if total_minute < 0 or else total_minute >= Minutes_in_hour then
				time.set_minute (mod (total_minute, Minutes_in_hour))
				hour_add (div (total_minute, Minutes_in_hour))
			else
				time.set_minute (total_minute)
			end
		end

	plus alias "+" (d: DATE_TIME_DURATION): like Current
			-- Sum the current object with d
		require
			d_not_void: d /= Void
		do
			Result := twin
			Result.add (d)
		ensure
			result_exists: Result /= Void
		end

	relative_duration (other: like Current): DATE_TIME_DURATION
			-- Duration from other to current date
		require -- from ABSOLUTE
			other_exists: other /= Void
		do
			create Result.make_fine (0, 0, days - other.days, hour - other.hour, minute - other.minute, fine_second - other.fine_second)
			Result := Result.to_canonical (other)
			Result.set_origin_date_time (other.twin)
		ensure -- from ABSOLUTE
			result_exists: Result /= Void
		ensure then
			origin_set: equal (other, Result.origin_date_time)
		end

	second_add (s: INTEGER_32)
			-- Add s seconds to the current time.
		local
			total_second: INTEGER_32
		do
			total_second := second + s
			if total_second < 0 or else total_second >= Seconds_in_minute then
				time.set_second (mod (total_second, Seconds_in_minute))
				minute_add (div (total_second, Seconds_in_minute))
			else
				time.set_second (total_second)
			end
		end
	
feature {NONE} -- Basic operations

	div (i, j: INTEGER_32): INTEGER_32
			-- (i \\ j) if i positive
			-- (i \\ j + 1) if i negative
			-- (from TIME_UTILITY)
		do
			Result := i // j
			if Result.to_double > i / j then
				Result := Result - 1
			end
		ensure -- from TIME_UTILITY
			result_definition: i = j * Result + mod (i, j)
		end

	mod (i, j: INTEGER_32): INTEGER_32
			-- (i \\ j) if i positive
			-- (i \\ j + j) if i negative
			-- (from TIME_UTILITY)
		do
			Result := i \\ j
			if Result < 0 then
				Result := Result + j
			end
		ensure -- from TIME_UTILITY
			positive_result: Result >= 0
			result_definition: i = j * div (i, j) + Result
		end
	
feature {NONE} -- Implementation

	Compact_date_attribute_name: STRING_8 = "compact_date"
			-- Name of compacte_date attribute in 5.3 and older version.
			-- (from DATE_VALUE)

	Day_mask: INTEGER_32 = 255
			-- (from DATE_VALUE)

	Day_shift: INTEGER_32 = 0
			-- Shift needed to extract/set year, month and day.
			-- (from DATE_VALUE)

	Days_in_months: ARRAY [INTEGER_32]
			-- Array containing number of days for each month of
			-- a non-leap year.
			-- (from DATE_CONSTANTS)
		once
			Result := <<31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31>>
		ensure -- from DATE_CONSTANTS
			result_exists: Result /= Void
			valid_count: Result.count = Months_in_year
		end

	Hour_mask: INTEGER_32 = 16711680
			-- (from TIME_VALUE)

	Hour_shift: INTEGER_32 = 16
			-- (from TIME_VALUE)

	Minute_mask: INTEGER_32 = 65280
			-- (from TIME_VALUE)

	Minute_shift: INTEGER_32 = 8
			-- Shift needed to extract/set hour and minute.
			-- (from TIME_VALUE)

	Month_mask: INTEGER_32 = 65280
			-- (from DATE_VALUE)

	Month_shift: INTEGER_32 = 8
			-- (from DATE_VALUE)

	Second_mask: INTEGER_32 = 255
			-- Mask used to extract/set hour, minute and second.
			-- (from TIME_VALUE)

	set_private_internal_compact_date (a_compact_date: like compact_date)
			-- Set a_compact_date to compact_date.
			-- (from DATE_VALUE)
		do
			set_compact_date (a_compact_date & 65535, (a_compact_date & 16711680) |>> 16, ((a_compact_date & 4278190080) |>> 24) & 255)
		ensure -- from DATE_VALUE
			compact_date_set: year | (month |<< 16) | (day |<< 24) = a_compact_date
		end

	Year_mask: INTEGER_32 = 4294901760
			-- Mask used to extract/set year, month and day.
			-- (from DATE_VALUE)

	Year_shift: INTEGER_32 = 16
			-- (from DATE_VALUE)
	
feature {NONE} -- Correction

	correct_mismatch
			-- Attempt to correct object mismatch using Mismatch_information.
			-- (from DATE_VALUE)
		do
			if attached {INTEGER_32_REF} Mismatch_information.item (Compact_date_attribute_name) as l_compact_date then
				set_private_internal_compact_date (l_compact_date.item)
			else
				Precursor {MISMATCH_CORRECTOR}
			end
		end

	Mismatch_information: MISMATCH_INFORMATION
			-- Original attribute values of mismatched object
			-- (from MISMATCH_CORRECTOR)
		once
			create Result
		end
	
feature -- Element Change

	copy (other: like Current)
			-- set date and time with the other attributes.
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		do
			if other /= Current then
				Precursor {ABSOLUTE} (other)
				date := other.date.twin
				time := other.time.twin
			end
		ensure -- from ANY
			is_equal: Current ~ other
		end

	set_date (d: DATE)
			-- Set date to d.
		require
			d_exists: d /= Void
		do
			date := d
		ensure
			date_set: date = d
		end

	set_time (t: TIME)
			-- Set time to t.
		require
			t_exists: t /= Void
		do
			time := t
		ensure
			time_set: time = t
		end
	
feature -- Output

	debug_output: STRING_8
			-- Printable representation of the current object
			-- With "standard" form: default_format_string
			-- Was declared in DATE_TIME as synonym of out.
		do
			Result := formatted_out (default_format_string)
		ensure -- from DEBUG_OUTPUT
			result_not_void: Result /= Void
		end

	formatted_out (s: STRING_8): STRING_8
			-- Printable representation of the current object
			-- With "standard" form: s
		require
			s_exists: s /= Void
		do
			Result := (create {DATE_TIME_CODE_STRING}.make (s)).create_string (Current)
		end

	Io: STD_FILES
			-- Handle to standard file setup
			-- (from ANY)
		once
			create Result
			Result.set_output_default
		ensure -- from ANY
			instance_free: class
			io_not_void: Result /= Void
		end

	out: STRING_8
			-- Printable representation of the current object
			-- With "standard" form: default_format_string
			-- Was declared in DATE_TIME as synonym of debug_output.
		do
			Result := formatted_out (default_format_string)
		ensure -- from ANY
			out_not_void: Result /= Void
		end

	print (o: detachable ANY)
			-- Write terse external representation of o
			-- on standard output.
			-- (from ANY)
		do
			if o /= Void then
				Io.put_string (o.out)
			end
		ensure -- from ANY
			instance_free: class
		end

	frozen tagged_out: STRING_8
			-- New string containing terse printable representation
			-- of current object
			-- (from ANY)
		external
			"built_in"
		ensure -- from ANY
			tagged_out_not_void: Result /= Void
		end
	
feature -- Platform

	Operating_environment: OPERATING_ENVIRONMENT
			-- Objects available from the operating system
			-- (from ANY)
		once
			create Result
		ensure -- from ANY
			instance_free: class
			operating_environment_not_void: Result /= Void
		end
	
feature -- Preconditions

	date_time_valid (s: STRING_8; code_string: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE_TIME
			-- And does the string s correspond to code_string?
			-- (from DATE_TIME_VALIDITY_CHECKER)
		require -- from DATE_TIME_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			Result := code.precise and code.correspond (s) and then code.is_date_time (s)
		end

	date_time_valid_with_base (s: STRING_8; code_string: STRING_8; base: INTEGER_32): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE_TIME
			-- And does the string s correspond to code_string?
			-- Use base century base.
			-- (from DATE_TIME_VALIDITY_CHECKER)
		require -- from DATE_TIME_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			code.set_base_century (base)
			Result := code.precise and code.correspond (s) and then code.is_date_time (s)
		end

	is_correct_date_time (y, mo, d, h, mi: INTEGER_32; s: REAL_64; twelve_hour_scale: BOOLEAN): BOOLEAN
			-- Is date-time specified by y, mo, d, h, mi, s
			-- correct?
			-- twelve_hour_scale specifies if the hour range is 1 - 12
			-- (if True) or 0 - 23 (if False).
			-- (from DATE_TIME_VALIDITY_CHECKER)
		do
			Result := is_correct_date (y, mo, d) and is_correct_time (h, mi, s, twelve_hour_scale)
		end
	
feature {NONE} -- Preconditions

	compact_date_valid (c_d: INTEGER_32): BOOLEAN
			-- Is compact date c_d valid?
			-- (from DATE_VALIDITY_CHECKER)
		local
			l_cd: INTEGER_32
			y, m, d: INTEGER_32
		do
			l_cd := ordered_compact_date
			set_private_internal_compact_date (c_d)
			d := day
			m := month
			y := year
			ordered_compact_date := l_cd
			Result := is_correct_date (y, m, d)
		end

	compact_time_valid (c_t: INTEGER_32): BOOLEAN
			-- Is compact time c_t valid?
			-- (from TIME_VALIDITY_CHECKER)
		local
			h, m, s: INTEGER_32
			l_c_t: like compact_time
		do
			l_c_t := compact_time
			compact_time := c_t
			h := hour
			m := minute
			s := second
			compact_time := l_c_t
			Result := h >= 0 and h < Hours_in_day and m >= 0 and m < Minutes_in_hour and s >= 0 and s < Seconds_in_minute
		end

	date_valid (s: STRING_8; code_string: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to code_string?
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			Result := code.precise_date and code.correspond (s) and then code.is_date (s)
		end

	date_valid_default (s: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to
			-- date_default_format_string?
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
		do
			Result := date_valid (s, date_default_format_string)
		end

	date_valid_default_with_base (s: STRING_8; base: INTEGER_32): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to
			-- date_default_format_string?
			-- Use base century base.
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
		do
			Result := date_valid_with_base (s, date_default_format_string, base)
		end

	date_valid_with_base (s: STRING_8; code_string: STRING_8; base: INTEGER_32): BOOLEAN
			-- Is the code_string enough precise
			-- To create an instance of type DATE
			-- And does the string s correspond to code_string?
			-- Use base century base.
			-- (from DATE_VALIDITY_CHECKER)
		require -- from DATE_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
			base_valid: base > 0 and (base \\ 100 = 0)
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			code.set_base_century (base)
			Result := code.precise_date and code.correspond (s) and then code.is_date (s)
		end

	is_correct_date (y, m, d: INTEGER_32): BOOLEAN
			-- Is date specified by y, m, and d a correct date?
			-- (from DATE_VALIDITY_CHECKER)
		do
			Result := m >= 1 and m <= Months_in_year and then d >= 1 and d <= days_in_i_th_month (m, y) and then y >= 0 and then y <= 65535
		end

	is_correct_time (h, m: INTEGER_32; s: REAL_64; twelve_hour_scale: BOOLEAN): BOOLEAN
			-- Is time represented by h, m, code, and s correct?
			-- twelve_hour_scale specifies if the hour range is 1 - 12
			-- (if True) or 0 - 23 (if False).
			-- (from TIME_VALIDITY_CHECKER)
		local
			min_hour: INTEGER_32
			max_hour: INTEGER_32
		do
			if twelve_hour_scale then
				min_hour := 1
				max_hour := 12
			else
				min_hour := 0
				max_hour := Hours_in_day - 1
			end
			Result := h >= min_hour and h <= max_hour and then m >= 0 and m < Minutes_in_hour and then s >= 0.to_double and s < Seconds_in_minute.to_double
		end

	ordered_compact_date_valid (c_d: INTEGER_32): BOOLEAN
			-- Is compact date c_d valid?
			-- (from DATE_VALIDITY_CHECKER)
		local
			l_cd: INTEGER_32
			y, m, d: INTEGER_32
		do
			l_cd := ordered_compact_date
			ordered_compact_date := c_d
			d := day
			m := month
			y := year
			ordered_compact_date := l_cd
			Result := is_correct_date (y, m, d)
		end

	time_valid (s: STRING_8; code_string: STRING_8): BOOLEAN
			-- Is the code_string enough precise
			-- to create an instance of type TIME?
			-- And does the string s correspond to code_string?
			-- (from TIME_VALIDITY_CHECKER)
		require -- from TIME_VALIDITY_CHECKER
			s_exists: s /= Void
			code_exists: code_string /= Void
		local
			code: DATE_TIME_CODE_STRING
		do
			create code.make (code_string)
			Result := code.precise_time and code.correspond (s) and then code.is_time (s)
		end
	
feature {NONE} -- Retrieval

	frozen internal_correct_mismatch
			-- Called from runtime to perform a proper dynamic dispatch on correct_mismatch
			-- from MISMATCH_CORRECTOR.
			-- (from ANY)
		local
			l_msg: STRING_8
			l_exc: EXCEPTIONS
		do
			if attached {MISMATCH_CORRECTOR} Current as l_corrector then
				l_corrector.correct_mismatch
			else
				create l_msg.make_from_string ("Mismatch: ")
				create l_exc
				l_msg.append (generating_type.name)
				l_exc.raise_retrieval_exception (l_msg)
			end
		end
	
feature {NONE} -- Status Report

	days_in_month: INTEGER_32
			-- Number of days in month 'month'.
			-- (from DATE_MEASUREMENT)
		do
			Result := days_in_i_th_month (month, year)
		ensure -- from DATE_MEASUREMENT
			positive_result: Result > 0
		end
	
invariant
		-- from COMPARABLE
	irreflexive_comparison: not (Current < Current)

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

		-- from DATE_TIME_MEASUREMENT
	date_exists: date /= Void
	time_exists: time /= Void

note
	copyright: "Copyright (c) 1984-2017, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class DATE_TIME

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