HOUR

Extracts the hour number (from 0 to 23) for a given time or timestamp.

Syntax

EXTRACT(HOUR FROM date_timestamp_expression string) → bigint

• date_timestamp_expression: A TIME, TIMESTAMP, or DATE expression.

Examples

HOUR example using a timestamp.

SELECT EXTRACT(HOUR FROM TIMESTAMP '2019-08-12 01:10:30.123456')
-- 1

HOUR example using a time.

SELECT EXTRACT(HOUR FROM TIME '01:10:30.123456')
-- 1

HOUR example using the CAST function.

SELECT EXTRACT(HOUR FROM CAST('2019-08-12 01:10:30' AS TIMESTAMP))
-- 1

Usage Notes

This function uses the EXTRACT function. When using the CAST function, timestamps containing milliseconds are not allowed.