Oracle 21c

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create table paaf(last_update_date timestamp);
insert into paaf values(TIMESTAMP '2021-12-01 05:30:00');
1 rows affected

insert into paaf values(TIMESTAMP '2022-12-01 05:30:00');
1 rows affected

insert into paaf values(DATE '2022-01-01');
1 rows affected

select * from paaf where last_update_date >= TIMESTAMP '2022-01-01 00:00:00';

LAST_UPDATE_DATE

01-DEC-22 05.30.00.000000

01-JAN-22 00.00.00.000000