date_floor

description

Syntax

DATETIME DATE_FLOOR(DATETIME datetime, INTERVAL period type)

将日期转化为指定的时间间隔周期的最近下取整时刻。

datetime 参数是合法的日期表达式。

period 参数是指定每个周期有多少个单位组成，开始的时间起点为0001-01-01T00:00:00.

type 参数可以是下列值：YEAR, MONTH, DAY, HOUR, MINUTE, SECOND.

example

mysql>select date_floor("0001-01-01 00:00:16",interval 5 second);
+---------------------------------------------------------------+
| second_floor('0001-01-01 00:00:16', 5, '0001-01-01 00:00:00') |
+---------------------------------------------------------------+
| 0001-01-01 00:00:15                                           |
+---------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>select date_floor("0001-01-01 00:00:18",interval 5 second);
+---------------------------------------------------------------+
| second_floor('0001-01-01 00:00:18', 5, '0001-01-01 00:00:00') |
+---------------------------------------------------------------+
| 0001-01-01 00:00:15                                           |
+---------------------------------------------------------------+
1 row in set (0.01 sec)

mysql>select date_floor("2023-07-13 22:28:18",interval 5 minute);
+---------------------------------------------------------------+
| minute_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+---------------------------------------------------------------+
| 2023-07-13 22:25:00                                           |
+---------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>select date_floor("2023-07-13 22:28:18",interval 5 hour);
+-------------------------------------------------------------+
| hour_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+-------------------------------------------------------------+
| 2023-07-13 18:00:00                                         |
+-------------------------------------------------------------+
1 row in set (0.01 sec)

mysql>select date_floor("2023-07-13 22:28:18",interval 5 day);
+------------------------------------------------------------+
| day_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+------------------------------------------------------------+
| 2023-07-10 00:00:00                                        |
+------------------------------------------------------------+
1 row in set (0.00 sec)

mysql>select date_floor("2023-07-13 22:28:18",interval 5 month);
+--------------------------------------------------------------+
| month_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+--------------------------------------------------------------+
| 2023-07-01 00:00:00                                          |
+--------------------------------------------------------------+
1 row in set (0.01 sec)

mysql>select date_floor("2023-07-13 22:28:18",interval 5 year);
+-------------------------------------------------------------+
| year_floor('2023-07-13 22:28:18', 5, '0001-01-01 00:00:00') |
+-------------------------------------------------------------+
| 2021-01-01 00:00:00                                         |
+-------------------------------------------------------------+

keywords

DATE_FLOOR,DATE,FLOOR

date_floor​

description​

Syntax​

example​

keywords​

date_floor

description

Syntax

example

keywords