DATETRUNC

Date/Time functions

Syntax

DATETRUNC( datetime, unit [ , number ] )

Description

Rounds datetime down to the given unit. If optional number is given, then the value is rounded down to a number multiple of unit (omitting number is the same as number = 1).

Supported units:

"second",
"minute",
"hour",
"day" (acts as the day of the year if number is specified),
"week",
"month",
"year".

Argument types:

datetime — Date | Datetime
unit — String
number — Number (whole)

Return type: Same type as (datetime)

Note

Only constant values are accepted for arguments (unit, number).

Note

The function with three arguments is only available for the sources Materialized Dataset, ClickHouse version 19.3.3 or higher.

Examples

DATETRUNC(#2018-07-12 11:07:13#, "minute") = #2018-07-12 11:07:00#

DATETRUNC(#2018-07-12#, "year", 5) = #2015-01-01#

DATETRUNC(#2018-07-12 11:07:13#, "second", 5) = #2018-07-12 11:07:10#

DATETRUNC(#2018-07-12 11:07:13#, "month", 4) = #2018-05-01 00:00:00#

Data source support

Materialized Dataset, ClickHouse 1.1, PostgreSQL 9.3.