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

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