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time_slice
Description
Converts a given time into the beginning of a time interval based on the specified time granularity. This function is supported from v2.3.
Syntax
DATETIME time_slice(DATETIME dt, INTERVAL N type)
Parameters
dt
: the time to convert. The supported data type is DATETIME.INTERVAL N type
: the time granularity.N
is a number of the INT type.type
is the unit, which can be YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, WEEK, and QUARTER.
Return value
Returns a value of the DATETIME type.
Usage notes
The time interval starts from A.D. 0001-01-01 00:00:00
.
Examples
Example 1: Convert a given time to the start time of a 5-second time interval.
In this example, the time granularity is 5 second. The first time interval is from 2022-04-26 19:01:00
to 2022-04-26 19:01:04
. 2022-04-26 19:01:07
falls into the second interval which starts from 2022-04-26 19:01:05
and this value is returned.
mysql> select time_slice('2022-04-26 19:01:07', interval 5 second);
+------------------------------------------------------+
| time_slice('2022-04-26 19:01:07', INTERVAL 5 SECOND) |
+------------------------------------------------------+
| 2022-04-26 19:01:05 |
+------------------------------------------------------+
Example 2: Convert a given time to the start time of a 5-day time interval.
In this example, the time granularity is 5 day. The first time interval is from 0001-01-01 19:01:07
to 0001-01-05 19:01:07
. 0001-01-07 19:01:07
falls into the second interval which starts from 0001-01-06 19:01:07
and this value is returned.
mysql> select time_slice('0001-01-07 19:01:07', interval 5 day);
+---------------------------------------------------+
| time_slice('0001-01-07 19:01:07', INTERVAL 5 DAY) |
+---------------------------------------------------+
| 0001-01-06 00:00:00 |
+---------------------------------------------------+