Add Months in PLSQL

Example 1

SELECT ADD_MONTHS(TO_DATE('2021-08-01-00.00.00', 'YYYY-MM-DD-HH24.MI.SS', 'NLS_CALENDAR=GREGORIAN'), 3)
FROM   DUAL;

Output:

Example 2

SELECT ADD_MONTHS(DATE '2016-02-29', 1)
FROM   DUAL;

Output:

Useful Links:

> PLSQL | ADD_MONTHS Function