note
	description: "Absolute times"
	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 $"
	access: time
	eis: "name=Obtaining a DATE from a DATE_TIME and vice versa", "src=$(ISE_DOC_UUID)/195849fc-1a9c-d734-2d2b-acae78133886#Obtaining_a_DATE_from_a_DATE_TIME_and_vice_versa", "tag=EiffelTime"

class 
	TIME

create 
	make,
	make_fine,
	make_now,
	make_now_utc,
	make_by_seconds,
	make_by_fine_seconds,
	make_from_string,
	make_from_string_default,
	make_by_compact_time

feature -- Initialization

	make (h, m, s: INTEGER_32)
			-- Set hour, minute' and second to h, m, s respectively.
		require
			correct_time: is_correct_time (h, m, s.to_double, False)
		do
			set_hour (h)
			set_minute (m)
			set_second (s)
			fractional_second := 0.to_double
		ensure
			hour_set: hour = h
			minute_set: minute = m
			second_set: second = s
			fractional_second_set: fractional_second = 0.to_double
		end

	make_by_compact_time (c_t: INTEGER_32)
			-- Initialize from compact_time.
		require
			c_t_valid: compact_time_valid (c_t)
		do
			compact_time := c_t
		ensure
			compact_time_set: compact_time = c_t
		end

	make_by_fine_seconds (sec: REAL_64)
			-- Set the object by the number of seconds sec.
		require
			s_large_enough: sec >= 0.to_double
			s_small_enough: sec < Seconds_in_day.to_double
		local
			s: INTEGER_32
		do
			s := sec.truncated_to_integer
			make_by_seconds (s)
			fractional_second := sec - s.to_double
		end

	make_by_seconds (sec: INTEGER_32)
			-- Set the object by the number of seconds sec from midnight.
		require
			s_large_enough: sec >= 0
			s_small_enough: sec < Seconds_in_day
		local
			h, m, s: INTEGER_32
		do
			s := sec
			h := s // Seconds_in_hour
			s := s - (h * Seconds_in_hour)
			m := s // Seconds_in_minute
			s := s - (m * Seconds_in_minute)
			make (h, m, s)
		ensure
			seconds_set: seconds = sec
		end

	make_fine (h, m: INTEGER_32; s: REAL_64)
			-- Set hour, minute' and second to h, m and truncated to
			-- integer part of s respectively.
			-- Set fractional_second to the fractional part of s.
		require
			correct_time: is_correct_time (h, m, s, False)
		local
			s_tmp: INTEGER_32
		do
			s_tmp := s.truncated_to_integer
			make (h, m, s_tmp)
			fractional_second := s - s_tmp.to_double
		ensure
			hour_set: hour = h
			minute_set: minute = m
			fine_second_set: fine_second = s
		end

	make_from_string (s: STRING_8; code: STRING_8)
			-- Initialize from a "standard" string of form
			-- code.
		require
			s_exists: s /= Void
			c_exists: code /= Void
			time_valid: time_valid (s, code)
		local
			time: TIME
		do
			time := (create {DATE_TIME_CODE_STRING}.make (code)).create_time (s)
			make_fine (time.hour, time.minute, time.fine_second)
		end

	make_from_string_default (s: STRING_8)
			-- Initialize from a "standard" string of form
			-- default_format_string.
		require
			s_exists: s /= Void
			time_valid: time_valid (s, default_format_string)
		do
			make_from_string (s, default_format_string)
		end

	make_now
			-- Set current time according to timezone.
		local
			l_date: C_DATE
		do
			create l_date
			make (l_date.hour_now, l_date.minute_now, l_date.second_now)
			fractional_second := l_date.millisecond_now / 1000
		end

	make_now_utc
			-- Set the current object to today's date in utc format.
		local
			l_date: C_DATE
		do
			create l_date.make_utc
			make (l_date.hour_now, l_date.minute_now, l_date.second_now)
			fractional_second := 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

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

	Date_time_tools: DATE_TIME_TOOLS
			-- Tools for outputting dates and times in different formats
			-- (from TIME_UTILITY)
		once
			create Result
		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 TIME_VALUE)
		do
			Result := second.to_double + fractional_second
		end

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

	generating_type: TYPE [detachable 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 time
			-- (from TIME_VALUE)
		do
			Result := (compact_time & Hour_mask) |>> Hour_shift
		end

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

	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

	minute: INTEGER_32
			-- Minute of the current time
			-- (from TIME_VALUE)
		do
			Result := (compact_time & Minute_mask) |>> Minute_shift
		end

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

	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

	Origin: TIME
			-- Origin time
		once
			create Result.make (0, 0, 0)
		ensure -- from ABSOLUTE
			result_exists: Result /= Void
		end

	second: INTEGER_32
			-- Second of the current time
			-- (from TIME_VALUE)
		do
			Result := compact_time & Second_mask
		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_default_format_string: STRING_8
			-- Default output format for times
			-- (from TIME_CONSTANTS)
		do
			Result := Date_time_tools.Time_default_format_string
		end
	
feature -- Measurement

	duration: TIME_DURATION
			-- Duration elapsed from midnight
		require -- from  ABSOLUTE
			True
		do
			create Result.make_fine (hour, minute, fine_second)
		ensure then
			seconds_large_enough: Result.seconds_count >= 0
			seconds_small_enough: Result.seconds_count < Seconds_in_day
		end

	fine_seconds: REAL_64
			-- Number of seconds and fractions of seconds elapsed from midnight
		do
			Result := (hour * Seconds_in_hour) + (minute * Seconds_in_minute).to_double + fine_second
		end

	seconds: INTEGER_32
			-- Number of seconds elapsed from midnight
		do
			Result := (hour * Seconds_in_hour) + (minute * Seconds_in_minute) + second
		ensure
			result_definition: Result = duration.seconds_count
		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: 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: TIME): BOOLEAN
			-- Is other attached to an object of the same type
			-- as current object and identical to it?
			-- (from COMPARABLE)
		require -- from ANY
			other_not_void: other /= Void
		do
			Result := not (Current < other) and not (other < Current)
		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: 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: 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 time before other?
		require -- from PART_COMPARABLE
			other_exists: other /= Void
		local
			l_current, l_other: like compact_time
		do
			l_current := compact_time
			l_other := other.compact_time
			Result := (l_current < l_other) or else ((l_current = l_other) and (fractional_second < other.fractional_second and then (other.fractional_second - fractional_second) > 1.0e-10))
		ensure then -- from COMPARABLE
			asymmetric: Result implies not (other < Current)
		end

	is_less_equal alias "<=" (other: 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: TIME): 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: TIME): 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: 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: 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

	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 -- Element change

	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_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_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
	
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

	copy (other: TIME)
			-- Update current object using fields of object attached
			-- to other, so as to yield equal objects.
			-- (from ANY)
		require -- from ANY
			other_not_void: other /= Void
			type_identity: same_type (other)
		external
			"built_in"
		ensure -- from ANY
			is_equal: Current ~ 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: 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: 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: 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: 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: 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

	frozen as_attached: attached 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

	frozen default: detachable 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

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

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

	hour_add (h: INTEGER_32)
			-- Add h hours to the current object.
		do
			set_hour (mod (hour + h, Hours_in_day))
		end

	hour_back
			-- Move to evious hour.
		do
			if hour > 0 then
				set_hour (hour - 1)
			else
				set_hour (Hours_in_day - 1)
			end
		end

	hour_forth
			-- Move to next hour.
		do
			if hour < Hours_in_day - 1 then
				set_hour (hour + 1)
			else
				set_hour (0)
			end
		end

	minus alias "-" (other: TIME): INTERVAL [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 object.
		local
			total_minute: INTEGER_32
		do
			total_minute := minute + m
			if total_minute < 0 or else total_minute >= Minutes_in_hour then
				set_minute (mod (total_minute, Minutes_in_hour))
				hour_add (div (total_minute, Minutes_in_hour))
			else
				set_minute (total_minute)
			end
		end

	minute_back
			-- Move to evious minute.	
		do
			if minute > 0 then
				set_minute (minute - 1)
			else
				set_minute (Minutes_in_hour - 1)
				hour_back
			end
		end

	minute_forth
			-- Move to next minute.
		do
			if minute < Minutes_in_hour - 1 then
				set_minute (minute + 1)
			else
				set_minute (0)
				hour_forth
			end
		end

	plus alias "+" (t: TIME_DURATION): TIME
			-- Sum of the current time and duration t
		require
			t_exists: t /= Void
		do
			Result := twin
			Result.fine_second_add (t.fine_second)
			Result.minute_add (t.minute)
			Result.hour_add (t.hour)
		ensure
			result_exists: Result /= Void
		end

	relative_duration (other: like Current): TIME_DURATION
			-- Duration elapsed from other to Current
		require -- from ABSOLUTE
			other_exists: other /= Void
		do
			create Result.make_by_fine_seconds (fine_seconds - other.fine_seconds)
			Result := Result.to_canonical
		ensure -- from ABSOLUTE
			result_exists: Result /= Void
		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
				set_fine_second (mod (total_second, Seconds_in_minute).to_double + fractional_second)
				minute_add (div (total_second, Seconds_in_minute))
			else
				set_fine_second (total_second.to_double + fractional_second)
			end
		end

	second_back
			-- Move to previous second.
		do
			if fine_second > 0.to_double then
				set_fine_second (fine_second - 1.to_double)
			else
				set_fine_second (Seconds_in_minute - 1.to_double)
				minute_back
			end
		end

	second_forth
			-- Move to next second.
		do
			if fine_second < Seconds_in_minute - 1.to_double then
				set_fine_second (fine_second + 1.to_double)
			else
				set_fine_second (0.to_double)
				minute_forth
			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

	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)

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

	debug_output: STRING_8
			-- Printable representation of time with "standard"
			-- Form: time_default_format_string
			-- Was declared in TIME as synonym of out.
		do
			Result := formatted_out (time_default_format_string)
		ensure -- from DEBUG_OUTPUT
			result_not_void: Result /= Void
		end

	formatted_out (s: STRING_8): STRING_8
			-- Printable representation of time with "standard"
			-- Form: s
		require
			s_exists: s /= Void
		do
			Result := (create {DATE_TIME_CODE_STRING}.make (s)).create_time_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 time with "standard"
			-- Form: time_default_format_string
			-- Was declared in TIME as synonym of debug_output.
		do
			Result := formatted_out (time_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

	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

	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

	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
	
invariant
	second_large_enough: second >= 0
	second_small_enough: second < Seconds_in_minute
	fractionals_large_enough: fractional_second >= 0.to_double
	fractionals_small_enough: fractional_second < 1.to_double
	minute_large_enough: minute >= 0
	minute_small_enough: minute < Minutes_in_hour
	hour_large_enough: hour >= 0
	hour_small_enough: hour < Hours_in_day

		-- from COMPARABLE
	irreflexive_comparison: not (Current < Current)

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

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 TIME

Generated by ISE EiffelStudio