Comments
DATE_TO_DAY sap function module
The below code shows how function module DATE_TO_DAY is used to calculate the day of the week a particular date is ('Monday', 'Friday', 'Sat.' etc).
Calculate day of week
DATA: ld_day TYPE c.
CALL FUNCTION 'DATE_TO_DAY'
EXPORTING
date = sy-datum
IMPORTING
weekday = ld_day.