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WEEK

Syntax

WEEK(date[,mode])

Description

This function returns the week number for date. The two-argument form of WEEK() allows you to specify whether the week starts on Sunday or Monday and whether the return value should be in the range from 0 to 53 or from 1 to 53. If the mode argument is omitted, the value of the default_week_format system variable is used.

Modes

Mode1st day of weekRangeWeek 1 is the 1st week with
0Sunday0-53a Sunday in this year
1Monday0-53more than 3 days this year
2Sunday1-53a Sunday in this year
3Monday1-53more than 3 days this year
4Sunday0-53more than 3 days this year
5Monday0-53a Monday in this year
6Sunday1-53more than 3 days this year
7Monday1-53a Monday in this year

With the mode value of 3, which means 'more than 3 days this year', weeks are numbered according to ISO 8601:1988.

Examples

SELECT WEEK('2008-02-20');
+--------------------+
| WEEK('2008-02-20') |
+--------------------+
|                  7 |
+--------------------+

SELECT WEEK('2008-02-20',0);
+----------------------+
| WEEK('2008-02-20',0) |
+----------------------+
|                    7 |
+----------------------+

SELECT WEEK('2008-02-20',1);
+----------------------+
| WEEK('2008-02-20',1) |
+----------------------+
|                    8 |
+----------------------+

SELECT WEEK('2008-12-31',0);
+----------------------+
| WEEK('2008-12-31',0) |
+----------------------+
|                   52 |
+----------------------+

SELECT WEEK('2008-12-31',1);
+----------------------+
| WEEK('2008-12-31',1) |
+----------------------+
|                   53 |
+----------------------+

 SELECT WEEK('2019-12-30',3);
+----------------------+
| WEEK('2019-12-30',3) |
+----------------------+
|                    1 |
+----------------------+

CREATE TABLE t1 (d DATETIME);
INSERT INTO t1 VALUES
    ("2007-01-30 21:31:07"),
    ("1983-10-15 06:42:51"),
    ("2011-04-21 12:34:56"),
    ("2011-10-30 06:31:41"),
    ("2011-01-30 14:03:25"),
    ("2004-10-07 11:19:34");

SELECT d, WEEK(d,0), WEEK(d,1) from t1;
+---------------------+-----------+-----------+
| d                   | WEEK(d,0) | WEEK(d,1) |
+---------------------+-----------+-----------+
| 2007-01-30 21:31:07 |         4 |         5 |
| 1983-10-15 06:42:51 |        41 |        41 |
| 2011-04-21 12:34:56 |        16 |        16 |
| 2011-10-30 06:31:41 |        44 |        43 |
| 2011-01-30 14:03:25 |         5 |         4 |
| 2004-10-07 11:19:34 |        40 |        41 |
+---------------------+-----------+-----------+
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