从日期取周

CALL FUNCTION 'DATE_GET_WEEK'
 EXPORTING
DATE         = LV_DATE
 IMPORTING
       WEEK         = LV_WEEK
      EXCEPTIONS
        DATE_INVALID = 1
        OTHERS       = 2.

周几

DATE_COMPUTE_DAY​​

另外其他相关函数自己看Function group就行

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