date_trunc function

date_trunc computes ts_val’s “floor value” of the specified time component, i.e. the largest time component less than or equal to the provided value.

To align values along arbitrary values, see date_bin.

Signatures

Parameter	Type	Description
val	`timestamp`, `timestamp with time zone`, `interval`	The value you want to truncate.

Return value

date_trunc returns the same type as val.

Examples

SELECT date_trunc('hour', TIMESTAMP '2019-11-26 15:56:46.241150') AS hour_trunc;

          hour_trunc
-------------------------------
 2019-11-26 15:00:00.000000000

SELECT date_trunc('year', TIMESTAMP '2019-11-26 15:56:46.241150') AS year_trunc;

          year_trunc
-------------------------------
 2019-01-01 00:00:00.000000000

SELECT date_trunc('millennium', INTERVAL '1234 years 11 months 23 days 23:59:12.123456789') AS millennium_trunc;

          millennium_trunc
-------------------------------
 1000 years