SWI_DURATION_DETERMINE

    call function `SWI_DURATION_DETERMINE`
      exporting
        start_date = lv_start_date
        end_date   = lv_end_date
        start_time = lv_start_time
        end_time   = lv_end_time
      importing
        duration   = lv_seconds.
    ls_sevkiyat-yol_suresi  = lv_seconds / 3600.