-- { echo }
select toDateTime64(toDateTime(1), 2);
1970-01-01 03:00:01.00
select toDateTime64(toDate(1), 2);
1970-01-02 00:00:00.00
select toDateTime64(toDateTime(1), 2, 'GMT');
1970-01-01 00:00:01.00
select toDateTime64(toDate(1), 2, 'GMT');
1970-01-02 00:00:00.00