ABAP日期处理函数

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  *&---------------------------------------------------------------------*
*& Report  ZQWE
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT  ZQWE.

DATA: DATE1 LIKE SY-DATUM,
      DATE2 LIKE SY-DATUM,
      DATE3 LIKE SY-DATUM,
      DATE4 LIKE SY-DATUM,
      DATE5 LIKE SY-DATUM,
      DATE6 LIKE SY-DATUM,
      DATE7 LIKE SY-DATUM.

DATA: WEEK1 LIKE SCAL-WEEK,
      WEEK2 LIKE SCAL-WEEK.

DATA: DAYS TYPE I.

DATA: SUND TYPE  P.

  DATA: DATE_L LIKE SY-DATUM,
        TIME_L LIKE SY-UZEIT.

PARAMETERS: GJAHR TYPE GJAHR OBLIGATORY,
                       MONAT TYPE MONAT OBLIGATORY,
                       TIME LIKE SY-UZEIT.

"搜索帮助
AT SELECTION-SCREEN ON VALUE-REQUEST FOR GJAHR.
  CALL FUNCTION 'F4_DATE'
   EXPORTING
     DATE_FOR_FIRST_MONTH               = SY-DATUM
   IMPORTING
     SELECT_DATE                        =  DATE_L
   EXCEPTIONS
     CALENDAR_BUFFER_NOT_LOADABLE       = 1
     DATE_AFTER_RANGE                   = 2
     DATE_BEFORE_RANGE                  = 3
     DATE_INVALID                       = 4
     FACTORY_CALENDAR_NOT_FOUND         = 5
     HOLIDAY_CALENDAR_NOT_FOUND         = 6
     PARAMETER_CONFLICT                 = 7
     OTHERS                             = 8
            .
  IF SY-SUBRC = 0.
    GJAHR = DATE_L+0(4).
  ENDIF.

START-OF-SELECTION.

  "某个月第一天
  CONCATENATE GJAHR MONAT '01' INTO DATE1.

  "某个月最后一天
  CALL FUNCTION 'RP_LAST_DAY_OF_MONTHS'
    EXPORTING
      DAY_IN            = DATE1
    IMPORTING
      LAST_DAY_OF_MONTH = DATE2
    EXCEPTIONS
      DAY_IN_NO_DATE    = 1
      OTHERS            = 2.

  "两个日期之间的天数
  DAYS = DATE2 - DATE1.

  "年度，月份，天数，往前往后推
  CALL FUNCTION 'RP_CALC_DATE_IN_INTERVAL' "从当前的日期往前推3个月得到一个日期
  EXPORTING
    DATE            = DATE2
    DAYS            = 0
    MONTHS          = 1
    SIGNUM          = '+'
    YEARS           = 0
  IMPORTING
    CALC_DATE       = DATE3.

  "根据日期获取到周数
  CALL FUNCTION 'DATE_GET_WEEK'
    EXPORTING
      DATE         = DATE3
    IMPORTING
      WEEK         = WEEK1
    EXCEPTIONS
      DATE_INVALID = 1
      OTHERS       = 2.

  "获取该周第一天
  CALL FUNCTION 'WEEK_GET_FIRST_DAY'
    EXPORTING
      WEEK         = WEEK1
    IMPORTING
      DATE         = DATE4
    EXCEPTIONS
      WEEK_INVALID = 1
      OTHERS       = 2.

  "根据周数，获取下一周周数，星期一与星期天
  CALL FUNCTION 'NEXT_WEEK'
    EXPORTING
      CURRENT_WEEK       =  WEEK1
   IMPORTING
     NEXT_WEEK          = WEEK2
     MONDAY             =  DATE5
     SUNDAY             =     DATE6      .

"根据日期获取星期几
"返回为数字，数字与星期X或者monday之类对应关系TABLES: T246.
CALL FUNCTION 'DAY_IN_WEEK'
  EXPORTING
    DATUM         = DATE4
IMPORTING
   WOTNR         =      SUND     .

WRITE:/ DATE1, DATE2, DAYS, DATE3, WEEK1, DATE4, SUND, WEEK2, DATE5, DATE6.