Oracle APEX SQL Date Time Import Procedure - sql

Question

I have a field (v_date) that contains date and time value e.g.(30-07-2021 13:30)
I want to import to my table two new dates and time values according to this field.
The first will be seven days later (08-06-2021 13:30), and the second one will be 7 days and one hour later (08-06-2021 14:30).
This is my code:
create or replace PROCEDURE "PR_ADD_MASSIVE_SESSIONS"
(v_date date)
IS
v_counter_day number :=7;
v_session_temp_date date;
v_session_temp_end date;
BEGIN
v_session_temp_date := to_date(v_date, 'MM-DD-YYYY HH24:MI') + v_counter_day;
v_session_temp_end := to_date(v_date, 'MM-DD-YYYY HH24:MI') + (v_counter_day + (1/1440*60));
INSERT INTO SESSIONS (CLIENTS_ID, SESSION_AREA, SESSION_DATE, SESSION_STOP, PAYMENT_TYPE_ID, PRICE, STATUS, COMPLETED, PAYMENT_STATUS, SESSION_NO)
VALUES (5, 1, v_session_temp_date, v_session_temp_end, 2, 40, 1, 1, 1, 1);
END;
And I get this error: Ajax call returned server error ORA-01843: not a valid month.
I try with to_char but the compiler only wants to_date in order to have a successful procedure.

Answer 1

The variables v_session_temp_date and v_session_temp_date are defined as DATE. The function TO_DATE converts a string to a date. It should not be used on variables of type DATE. Remove the TO_DATE and you're good to go. Example code below (using an anonymous block, not a procedure)
CREATE TABLE sessions
(
clients_id NUMBER,
session_area NUMBER,
session_date DATE,
session_stop DATE,
payment_type_id NUMBER,
price NUMBER,
status NUMBER,
completed NUMBER,
payment_status NUMBER,
session_no NUMBER
);
Table SESSIONS created.
--original code
DECLARE
v_date date := SYSDATE;
v_counter_day number := 7;
v_session_temp_date date;
v_session_temp_end date;
BEGIN
v_session_temp_date := to_date(v_date, 'MM-DD-YYYY HH24:MI') + v_counter_day;
v_session_temp_end := to_date(v_date, 'MM-DD-YYYY HH24:MI') + (v_counter_day + (1/1440*60));
INSERT INTO SESSIONS (CLIENTS_ID, SESSION_AREA, SESSION_DATE, SESSION_STOP, PAYMENT_TYPE_ID, PRICE, STATUS, COMPLETED, PAYMENT_STATUS, SESSION_NO)
VALUES (5, 1, v_session_temp_date, v_session_temp_end, 2, 40, 1, 1, 1, 1);
END;
/
ORA-01843: not a valid month
ORA-06512: at line 7
01843. 00000 - "not a valid month"
*Cause:
*Action:
--fixed code
DECLARE
v_date date := SYSDATE;
v_counter_day number := 7;
v_session_temp_date date;
v_session_temp_end date;
BEGIN
v_session_temp_date := v_date + v_counter_day;
v_session_temp_end := v_date + (v_counter_day + (1/1440*60));
INSERT INTO SESSIONS (CLIENTS_ID, SESSION_AREA, SESSION_DATE, SESSION_STOP, PAYMENT_TYPE_ID, PRICE, STATUS, COMPLETED, PAYMENT_STATUS, SESSION_NO)
VALUES (5, 1, v_session_temp_date, v_session_temp_end, 2, 40, 1, 1, 1, 1);
END;
/
PL/SQL procedure successfully completed.