note description: "Absolute dates" 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 $" access: date eis: "name=DATE / TIME to STRING Conversion", "src=$(ISE_DOC_UUID)/88972ba4-694b-8558-b0c8-87b1fc40afc4", "tag=EiffelTime" 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 interface DATE create make (y, m, d: INTEGER_32) -- Set year, month and day to y, m, d respectively. require correct_date: is_correct_date (y, m, d) ensure year_set: year = y month_set: month = m day_set: day = d make_month_day_year (m, d, y: INTEGER_32) -- Set month, day and year to m, d and y respectively. require correct_date: is_correct_date (y, m, d) ensure year_set: year = y month_set: month = m day_set: day = d make_day_month_year (d, m, y: INTEGER_32) -- Set day, month and year to d, m and y respectively. require correct_date: is_correct_date (y, m, d) ensure year_set: year = y month_set: month = m day_set: day = d make_now -- Set the current object to today's date. make_now_utc -- Set the current object to today's date in utc format. make_by_days (n: INTEGER_32) -- Set the current date with the number of days n since Origin. ensure days_set: days = n make_from_string_default (s: STRING_8) -- Initialize from a "standard" string of form -- date_default_format_string. -- (For 2-digit year specifications, the current century is used as -- base century.) require s_exists: s /= Void date_valid: date_valid (s, date_default_format_string) make_from_string_default_with_base (s: STRING_8; base: INTEGER_32) -- Initialize from a "standard" string of form -- date_default_format_string with base century base. require s_exists: s /= Void base_valid: base > 0 and (base \\ 100 = 0) date_valid: date_valid_with_base (s, date_default_format_string, base) 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_valid: date_valid (s, code) 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_valid: date_valid_with_base (s, code, base) make_by_compact_date (c_d: INTEGER_32) -- Initialize from a compact_date. require c_d_valid: compact_date_valid (c_d) ensure compact_date_set: year | (month |<< 16) | (day |<< 24) = c_d make_by_ordered_compact_date (c_d: INTEGER_32) -- Initialize from a ordered_compact_date. require c_d_valid: ordered_compact_date_valid (c_d) ensure ordered_compact_date_set: ordered_compact_date = c_d feature -- Initialization make (y, m, d: INTEGER_32) -- Set year, month and day to y, m, d respectively. require correct_date: is_correct_date (y, m, d) ensure year_set: year = y month_set: month = m day_set: day = d make_by_days (n: INTEGER_32) -- Set the current date with the number of days n since Origin. ensure days_set: days = n make_by_ordered_compact_date (c_d: INTEGER_32) -- Initialize from a ordered_compact_date. require c_d_valid: ordered_compact_date_valid (c_d) ensure ordered_compact_date_set: ordered_compact_date = c_d make_day_month_year (d, m, y: INTEGER_32) -- Set day, month and year to d, m and y respectively. require correct_date: is_correct_date (y, m, d) ensure year_set: year = y month_set: month = m day_set: day = d 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_valid: date_valid (s, code) make_from_string_default (s: STRING_8) -- Initialize from a "standard" string of form -- date_default_format_string. -- (For 2-digit year specifications, the current century is used as -- base century.) require s_exists: s /= Void date_valid: date_valid (s, date_default_format_string) make_from_string_default_with_base (s: STRING_8; base: INTEGER_32) -- Initialize from a "standard" string of form -- date_default_format_string with base century base. require s_exists: s /= Void base_valid: base > 0 and (base \\ 100 = 0) date_valid: date_valid_with_base (s, date_default_format_string, base) 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_valid: date_valid_with_base (s, code, base) make_month_day_year (m, d, y: INTEGER_32) -- Set month, day and year to m, d and y respectively. require correct_date: is_correct_date (y, m, d) ensure year_set: year = y month_set: month = m day_set: day = d make_now -- Set the current object to today's date. make_now_utc -- Set the current object to today's date in utc format. feature -- Access date_default_format_string: STRING_8 -- Default output format for dates -- (from DATE_CONSTANTS) Date_time_tools: DATE_TIME_TOOLS -- Tools for outputting dates and times in different formats -- (from TIME_UTILITY) day: INTEGER_32 -- Day of the current object -- (from DATE_VALUE) 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 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) default_format_string: STRING_8 -- Default output format string -- (from TIME_UTILITY) generating_type: TYPE [detachable DATE] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty long_days_text: ARRAY [STRING_8] -- Long text representation of days -- (from DATE_CONSTANTS) long_months_text: ARRAY [STRING_8] -- Long text representation of months -- (from DATE_CONSTANTS) Max_weeks_in_year: INTEGER_32 = 53 -- Maximun number of weeks in a year -- (from DATE_CONSTANTS) month: INTEGER_32 -- Month of the current object -- (from DATE_VALUE) 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) ordered_compact_date: INTEGER_32 -- Year, month, day coded for fast comparison between dates. -- (from DATE_VALUE) Origin: DATE -- Origin date ensure -- from ABSOLUTE result_exists: Result /= Void year: INTEGER_32 -- Year of the current object -- (from DATE_VALUE) feature -- Measurement days: INTEGER_32 -- Number of days elapsed since Origin ensure same_duration: Result = duration.day duration: DATE_DURATION -- Definite duration elapsed since Origin require -- from ABSOLUTE True ensure then definite_result: Result.definite duration_set: ((Current - Origin).duration).is_equal (Result) 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) 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) 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) 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)) frozen is_deep_equal (other: DATE): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void 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) is_equal (other: DATE): 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 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)) is_greater alias ">" (other: DATE): BOOLEAN -- Is current object greater than other? -- (from COMPARABLE) require -- from PART_COMPARABLE other_exists: other /= Void ensure then -- from COMPARABLE definition: Result = (other < Current) is_greater_equal alias ">=" (other: DATE): BOOLEAN -- Is current object greater than or equal to other? -- (from COMPARABLE) require -- from PART_COMPARABLE other_exists: other /= Void ensure then -- from COMPARABLE definition: Result = (other <= Current) is_less alias "<" (other: like Current): BOOLEAN -- Is the current date before other? require -- from PART_COMPARABLE other_exists: other /= Void ensure then -- from COMPARABLE asymmetric: Result implies not (other < Current) is_less_equal alias "<=" (other: DATE): BOOLEAN -- Is current object less than or equal to other? -- (from COMPARABLE) require -- from PART_COMPARABLE other_exists: other /= Void ensure then -- from COMPARABLE definition: Result = ((Current < other) or (Current ~ other)) max (other: DATE): DATE -- The greater of current object and other -- (from COMPARABLE) require -- from COMPARABLE other_exists: other /= Void ensure -- from COMPARABLE current_if_not_smaller: Current >= other implies Result = Current other_if_smaller: Current < other implies Result = other min (other: DATE): DATE -- The smaller of current object and other -- (from COMPARABLE) require -- from COMPARABLE other_exists: other /= Void ensure -- from COMPARABLE current_if_not_greater: Current <= other implies Result = Current other_if_greater: Current > other implies Result = other 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) 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)) frozen standard_is_equal (other: DATE): 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 ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) three_way_comparison (other: DATE): INTEGER_32 -- If current object equal to other, 0; -- if smaller, -1; if greater, 1 -- (from COMPARABLE) require -- from COMPARABLE other_exists: other /= Void ensure -- from COMPARABLE equal_zero: (Result = 0) = (Current ~ other) smaller_negative: (Result = -1) = (Current < other) greater_positive: (Result = 1) = (Current > other) 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 day_of_january_1st: INTEGER_32 -- Day of the week of january 1st of the current year ensure day_of_the_week_definition: Result > 0 and then Result < 8 day_of_the_week: INTEGER_32 -- Number of day from the beginning of the week -- sunday is 1, etc.., saturday is 7 ensure day_of_the_week_range: Result > 0 and then Result < 8 days_at_month: INTEGER_32 -- Number of days from the beginning of the year -- until the beginning of the current month ensure positive_result: Result >= 0 days_from (y: INTEGER_32): INTEGER_32 -- Days between the current year and year y days_in_year: INTEGER_32 -- Number of days in the current year ensure valid_result: (leap_year implies Result = Days_in_leap_year) and then (not leap_year implies Result = Days_in_non_leap_year) is_leap_year (y: INTEGER_32): BOOLEAN -- Is year y a leap year? -- (from DATE_CONSTANTS) leap_year: BOOLEAN -- Is the current year a leap year? 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 ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) week_of_year: INTEGER_32 -- Number of weeks from the beginning of the year -- The first week of the year begins on the first sunday of the year -- The week number before the first sunday of the year is 0 ensure positive_result: Result >= 0 result_small_enough: Result < Max_weeks_in_year year_day: INTEGER_32 -- Number of days from the beginning of the year ensure result_large_enough: Result >= 1 result_small_enough: Result <= days_in_year feature -- Element change set_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) ensure -- from DATE_MEASUREMENT day_set: day = d month_set: month = m year_set: year = y 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 ensure -- from DATE_MEASUREMENT day_set: day = d 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) ensure -- from DATE_VALUE ordered_compact_date_set: ordered_compact_date = a_ordered_compact_date 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) ensure -- from DATE_MEASUREMENT month_set: month = m 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) ensure -- from DATE_MEASUREMENT year_set: year = y feature -- Conversion to_date_time: DATE_TIME -- Date-time version, with a zero time component feature -- Duplication copy (other: DATE) -- 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) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: DATE) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: DATE -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: DATE) -- 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) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: DATE -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: DATE -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations add (d: DATE_DURATION) -- Adds d to the current date. -- if d is not definite, add years and months and then days. require d_not_void: d /= Void day_add (d: INTEGER_32) -- Add d days to the current date. ensure days_set: days = old days + d day_back -- Move to previous day. ensure days_set: days = old days - 1 day_forth -- Move to next day. -- days is from the origin, day is current. ensure days_set: days = old days + 1 frozen default: detachable DATE -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class minus alias "-" (other: DATE): INTERVAL [DATE] -- Interval between current object and other. -- (from ABSOLUTE) require -- from ABSOLUTE other_exists: other /= Void other_smaller_than_current: 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) month_add (m: INTEGER_32) -- Add m months to the current date. -- Can move days backward. month_back -- Move to previous month. -- Can move days backward if previous month has less days than the -- current month. month_forth -- Move to next month. -- Can move days backward if next month has less days than the -- current month. plus alias "+" (d: DATE_DURATION): DATE -- Sum to current date the duration d -- if duration not define, add years and then months and then days. require d_not_void: d /= Void ensure result_exists: Result /= Void definite_set: d.definite implies (Result - Current).duration.is_equal (d) relative_duration (other: like Current): DATE_DURATION -- Duration from other to the current date require -- from ABSOLUTE other_exists: other /= Void ensure -- from ABSOLUTE result_exists: Result /= Void ensure then exact_duration: (other + Result).is_equal (Current) canonical_duration: Result.canonical (other) origin_date_set: equal (Result.origin_date, other) year_add (y: INTEGER_32) -- Add y years to the current date. -- May cut the 29th february. ensure year_set: year = old year + y year_back -- Move to previous year. -- May cut the 29th february. ensure year_decreased: year = old year - 1 year_forth -- Move to next year. -- May cut the 29th february. ensure year_increased: year = old year + 1 year_month_add (y, m: INTEGER_32) -- Add y years and m months to the current date. -- Check the number of days after. feature -- Correction correct_mismatch -- Attempt to correct object mismatch using Mismatch_information. -- (from DATE_VALUE) Mismatch_information: MISMATCH_INFORMATION -- Original attribute values of mismatched object -- (from MISMATCH_CORRECTOR) feature -- Output debug_output: STRING_8 -- Printable representation of Current with "standard" -- Form: date_default_format_string -- Was declared in DATE as synonym of out. ensure -- from DEBUG_OUTPUT result_not_void: Result /= Void formatted_out (s: STRING_8): STRING_8 -- Printable representation of Current with "standard" -- Form: s require s_exists: s /= Void Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- Printable representation of Current with "standard" -- Form: date_default_format_string -- Was declared in DATE as synonym of debug_output. ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void feature -- Preconditions compact_date_valid (c_d: INTEGER_32): BOOLEAN -- Is compact date c_d valid? -- (from DATE_VALIDITY_CHECKER) 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 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 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) 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) is_correct_date (y, m, d: INTEGER_32): BOOLEAN -- Is date specified by y, m, and d a correct date? -- (from DATE_VALIDITY_CHECKER) ordered_compact_date_valid (c_d: INTEGER_32): BOOLEAN -- Is compact date c_d valid? -- (from DATE_VALIDITY_CHECKER) feature -- Status Report days_in_month: INTEGER_32 -- Number of days in month 'month'. -- (from DATE_MEASUREMENT) ensure -- from DATE_MEASUREMENT positive_result: Result > 0 invariant day_large_enough: day >= 1 day_small_enough: day <= days_in_month month_large_enough: month >= 1 month_small_enough: month <= Months_in_year year_small_enough: year <= 65535 year_non_negative: year >= 0 -- 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 DATE
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