SELECT sysdate + 1 FROM dual;                 -- Tomorrow    12/01/2021 14:27:27
SELECT trunc(sysdate) + 1 FROM dual;         -- Tomorrow    12/01/2021 00:00:00
SELECT sysdate + INTERVAL '20' DAY FROM DUAL;        -- 20 days ahead (other way)
SELECT sysdate + 1 / 24 FROM dual;                    -- 1 hour ahead
SELECT sysdate + 1 / 24 / 60 FROM dual;                -- 1 minute ahead
SELECT add_months(trunc(sysdate), 1) FROM dual;       -- 1 month ahead (no time)
SELECT trunc(sysdate) + 30 FROM dual;                -- 30 days ahead (no time)
SELECT add_months(trunc(sysdate), +12*2) FROM dual;    -- 2 years ahead (no time)