The below code shows how function module CONVERT_DATE_TO_EXTERNAL is used to convert a date field from is internal storage format to the users specific display format i.e. from YYYYMMDD to DD/MM/YYYY.
Convert date to users prefered output data: ld_date_int type datum, ld_date_ext type datum. CALL FUNCTION 'CONVERT_DATE_TO_EXTERNAL' EXPORTING date_internal = ld_date_int IMPORTING date_external = ld_date_ext EXCEPTIONS date_internal_is_invalid = 1 OTHERS = 2.