DML in PL/SQL

Question

Dear Experts,
I need to update table using PL/SQL procedure, I've built following procedure. The updates are run on date columns and follow format - DD-MON-RRRR HH24:MI:SS.
Any suggestions on how do I retain this format, can I input in the format when I'm entring the date values, If so, could you kindly suggest what's the modification?
CREATE OR REPLACE PROCEDURE USER1.UPDATE_PROC(STP_ACT_CMPL_DTTM_1 IN DATE, ACSL_SRV_ACT_END_DTTM_1 IN DATE, ACSL_MNTR_STP_ID_1 IN NUMBER)
IS
BEGIN
UPDATE SNIOTM.ACSL_MNTR_STP
SET STP_ACT_CMPL_DTTM = TO_DATE(STP_ACT_CMPL_DTTM_1, 'DD-MON-RRRR HH24:MI:SS'),
ACSL_SRV_ACT_END_DTTM = TO_DATE(ACSL_SRV_ACT_END_DTTM_1,'DD-MON-RRRR HH24:MI:SS')
WHERE ACSL_MNTR_STP_ID = ACSL_MNTR_STP_ID_1;
dbms_output.put_line(SQL%ROWCOUNT||' row(s) updated');
END ACCESSORIAL_UPDATE_PROC;
EXEC USER1.UPDATE_PROC('&STP_ACT_CMPL_DTTM_1', '&ACSL_SRV_ACT_END_DTTM_1', &ACSL_MNTR_STP_ID_1);

Answer 1

Date columns are stored in byts - dont have any format. Formats are used only for display purpose, not for storage.
You could pass date itself to the procedure...
CREATE OR REPLACE PROCEDURE USER1.UPDATE_PROC
STP_ACT_CMPL_DTTM_1 IN DATE,
ACSL_SRV_ACT_END_DTTM_1 IN DATE,
ACSL_MNTR_STP_ID_1 IN NUMBER
IS
BEGIN
UPDATE SNIOTM.ACSL_MNTR_STP
--"Remove TO_DATE as the colums are already date datatype"
SET STP_ACT_CMPL_DTTM = STP_ACT_CMPL_DTTM_1,
ACSL_SRV_ACT_END_DTTM = ACSL_SRV_ACT_END_DTTM_1
WHERE ACSL_MNTR_STP_ID = ACSL_MNTR_STP_ID_1;
dbms_output.put_line(SQL%ROWCOUNT||' row(s) updated');
END ACCESSORIAL_UPDATE_PROC;
--"Pass date type arguments in the procedure call.
EXEC USER1.UPDATE_PROC(to_date('&STP_ACT_CMPL_DTTM_1', 'DD-MON-RRRR HH24:MI:SS'),to_date('&ACSL_SRV_ACT_END_DTTM_1', 'DD-MON-RRRR HH24:MI:SS'),&ACSL_MNTR_STP_ID_1);
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