DATE_TRUNC
The DATE_TRUNC function truncates a timestamp expression or literal based on the date part that you specify. DATE_TRUNC returns the first day of the specified year, the first day of the specified month, or the Monday of the specified week.
Syntax
DATE_TRUNC('datepart', timestamp)
Example
SELECT DATE_TRUNC('HOUR', TIMESTAMP '2020-01-14 13:22:35') AS HOUR;
The above query returns:
2020-01-14 13:00:00