Extract Only the Day from Date in MySQL

To extract only the day instead of the entire date, you need to use DAYOFMONTH() function from MySQL.

Let us first create a table −

mysql> create table DemoTable747 (DueDate datetime);
Query OK, 0 rows affected (0.53 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable747 values('2019-01-31') ;
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable747 values('2018-12-01');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable747 values('2017-09-14');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable747 values('2016-07-21');
Query OK, 1 row affected (0.14 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable747;

This will produce the following output -

+---------------------+
| DueDate             |
+---------------------+
| 2019-01-31 00:00:00 |
| 2018-12-01 00:00:00 |
| 2017-09-14 00:00:00 |
| 2016-07-21 00:00:00 |
+---------------------+
4 rows in set (0.00 sec)

Following is the query to extract only the day instead of entire date −

mysql> select dayofmonth(DueDate) from DemoTable747;

This will produce the following output -

+---------------------+
| dayofmonth(DueDate) |
+---------------------+
|                  31 |
|                   1 |
|                  14 |
|                  21 |
+---------------------+
4 rows in set (0.00 sec)