SQL> SQL> declare 2 v_start_ts TIMESTAMP:= to_timestamp('14:00:00','HH24:MI:SS'); 3 v_end_ts TIMESTAMP:= to_timestamp('15:12:24','HH24:MI:SS'); 4 v_delta_int INTERVAL DAY TO SECOND; 5 begin 6 v_delta_int:=v_end_ts-v_start_ts; 7 DBMS_OUTPUT.put_line(v_delta_int); 8 end; 9 / +00 01:12:24.000000 PL/SQL procedure successfully completed. SQL>