METHODS add_days
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              days TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_hours
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              hours TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_milliseconds
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              milliseconds TYPE f
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_minutes
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              minutes TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_months
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              months TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_seconds
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              !seconds TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_ticks
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              ticks TYPE ty_tick
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_weeks
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              weeks TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS add_years
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              years TYPE i
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS algorithm_type
    RETURNING VALUE(result) TYPE ty_algorithm_type.

METHODS eras
    RETURNING VALUE(result) TYPE ty_tt_eras.

METHODS get_days_in_month
    IMPORTING year TYPE i
              month TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE i.

METHODS get_days_in_year
    IMPORTING year TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE i.

METHODS get_day_of_month
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_day_of_week
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE ty_day_of_week.

METHODS get_day_of_year
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_era
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_hour
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_leap_month
    IMPORTING year TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE i.

METHODS get_milliseconds
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE f.

METHODS get_minute
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_month
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_months_in_year
    IMPORTING year TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE i.

METHODS get_second
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS get_week_of_year
    IMPORTING date_time TYPE REF TO /ork/if_date_time
              rule TYPE ty_week_rule
              first_day_of_week TYPE ty_day_of_week
    RETURNING VALUE(result) TYPE i.

METHODS get_year
    IMPORTING date_time TYPE REF TO /ork/if_date_time
    RETURNING VALUE(result) TYPE i.

METHODS is_leap_day
    IMPORTING year TYPE i
              month TYPE i
              day TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE abap_bool.

METHODS is_leap_month
    IMPORTING year TYPE i
              month TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE abap_bool.

METHODS is_leap_year
    IMPORTING year TYPE i
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE abap_bool.

METHODS max_supported_date_time
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS min_supported_date_time
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS to_date_time
    IMPORTING year TYPE i
              month TYPE i
              day TYPE i
              hour TYPE i OPTIONAL
              minute TYPE i OPTIONAL
              second TYPE i OPTIONAL
              fffffff TYPE ty_hundreds_of_nanoseconds OPTIONAL
              era TYPE i DEFAULT current_era
    RETURNING VALUE(result) TYPE REF TO /ork/if_date_time.

METHODS to_four_digit_year
    IMPORTING year TYPE i
    RETURNING VALUE(result) TYPE i.

METHODS two_digit_year_max
    RETURNING VALUE(result) TYPE i.

TYPES ty_stamp TYPE timestampl.

TYPES ty_tt_int TYPE STANDARD TABLE OF i WITH EMPTY KEY.

TYPES ty_tt_eras TYPE ty_tt_int.

TYPES ty_algorithm_type TYPE i.

TYPES ty_week_rule TYPE i.

TYPES ty_day_of_week TYPE i.

TYPES ty_hundreds_of_nanoseconds TYPE i.

TYPES ty_tick TYPE int8.

BEGIN OF ty_s_date_numc,
      yyyy TYPE n LENGTH 4,
      mm TYPE n LENGTH 2,
      dd TYPE n LENGTH 2,
    END OF ty_s_date_numc.

BEGIN OF ty_s_time_numc,
      hh TYPE n LENGTH 4,
      mm TYPE n LENGTH 2,
      ss TYPE n LENGTH 2,
      fffffff TYPE n LENGTH 7,
    END OF ty_s_time_numc.

BEGIN OF ty_s_date,
      yyyy TYPE i,
      mm TYPE i,
      dd TYPE i,
    END OF ty_s_date.

BEGIN OF ty_s_time,
      hh TYPE i,
      mm TYPE i,
      ss TYPE i,
      fffffff TYPE i,
    END OF ty_s_time.

BEGIN OF ty_s_date_time,
      date TYPE ty_s_date,
      time TYPE ty_s_time,
      daylight TYPE abap_bool,
    END OF ty_s_date_time.

BEGIN OF ty_s_abap_date_time,
      date TYPE d,
      time TYPE t,
      fffffff TYPE i,
      daylight TYPE abap_bool,
    END OF ty_s_abap_date_time.

BEGIN OF cm_ticks_per,
      tick TYPE ty_tick VALUE '1',
      millisecond TYPE ty_tick VALUE '10000',
      second TYPE ty_tick VALUE '10000000',
      minute TYPE ty_tick VALUE '600000000',
      hour TYPE ty_tick VALUE '36000000000',
      day TYPE ty_tick VALUE '864000000000',
    END OF cm_ticks_per.

BEGIN OF cm_millis_per,
      millisecond TYPE i VALUE 1,
      second TYPE i VALUE 1000,
      minute TYPE i VALUE 60000,
      hour TYPE i VALUE 3600000,
      day TYPE i VALUE 86400000,
    END OF cm_millis_per.

BEGIN OF cm_seconds_per,
      second TYPE i VALUE 1,
      minute TYPE i VALUE 60,
      hour TYPE i VALUE 3600,
      day TYPE i VALUE 86400,
    END OF cm_seconds_per.

BEGIN OF cm_algorithm_type,
      "! An unknown calendar basis.
      unknown TYPE ty_algorithm_type VALUE 0,
      "! A solar-based calendar.
      solar TYPE ty_algorithm_type VALUE 1,
      "! A lunar-based calendar.
      lunar TYPE ty_algorithm_type VALUE 2,
      "! A lunisolar-based calendar.
      lunisolar TYPE ty_algorithm_type VALUE 3,
    END OF cm_algorithm_type.

BEGIN OF cm_week_rule,
      "! Indicates that the first week of the year starts on the first day of the year
      "! and ends before the following designated first day of the week. The value is 0.
      first_day TYPE ty_week_rule VALUE 0,
      "! Indicates that the first week of the year begins on the first occurrence of the
      "! designated first day of the week on or after the first day of the year. The value is 1.
      first_full_week TYPE ty_week_rule VALUE 1,
      "! Indicates that the first week of the year is the first week with four or more
      "! days before the designated first day of the week. The value is 2.
      first_four_day_week TYPE ty_week_rule VALUE 2,
    END OF cm_week_rule.

BEGIN OF cm_day_of_week,
      monday TYPE ty_day_of_week VALUE 1,
      tuesday TYPE ty_day_of_week VALUE 2,
      wednesday TYPE ty_day_of_week VALUE 3,
      thursday TYPE ty_day_of_week VALUE 4,
      friday TYPE ty_day_of_week VALUE 5,
      saturday TYPE ty_day_of_week VALUE 6,
      sunday TYPE ty_day_of_week VALUE 7,
    END OF cm_day_of_week.

CONSTANTS current_era TYPE i VALUE 1.

BEGIN OF cm_calendar_name,
      " the following 4 inherit from `EastAsianLunisolarCalendar`
      chinese_lunisolar_calendar TYPE string VALUE `ChineseLunisolarCalendar`,
      japanese_lunisolar_calendar TYPE string VALUE `JapaneseLunisolarCalendar`,
      korean_lunisolar_calendar TYPE string VALUE `KoreanLunisolarCalendar`,
      taiwan_lunisolar_calendar TYPE string VALUE `TaiwanLunisolarCalendar`,
      gregorian_calendar TYPE string VALUE `GregorianCalendar`,
      hebrew_calendar TYPE string VALUE `HebrewCalendar`,
      hijri_calendar TYPE string VALUE `HijriCalendar`,
      japanese_calendar TYPE string VALUE `JapaneseCalendar`,
      julian_calendar TYPE string VALUE `JulianCalendar`,
      korean_calendar TYPE string VALUE `KoreanCalendar`,
      persian_calendar TYPE string VALUE `PersianCalendar`,
      taiwan_calendar TYPE string VALUE `TaiwanCalendar`,
      thaibuddhist_calendar TYPE string VALUE `ThaiBuddhistCalendar`,
      um_al_qura_calendar TYPE string VALUE `UmAlQuraCalendar`,
    END OF cm_calendar_name.