Input: 06:00-24:00, Fr[2,-1] off Current: 06:00-24:00, Fr[-1,2] off Desired: 06:00-24:00; Fr[2,-1] off (1) Off rules should be at the end. (2) They should overwrite preceding rules, thus semicolon, not comma. A related UT: Fr.Sa,Su,Ph 11:00-14:30,Jan-Feb off Fr,Sa,Su,PH 11:00-14:30, Jan-Feb off Fr,Sa,Su,PH 11:00-14:30; Jan-Feb off