MySQL - Changing year of dates from 2020 to 2011?

You can change year of dates from 2020 to 2011 using SUBDATE() with INTERVAL of 9 year because there is a difference of 9 years between 2020 to 2011.

The syntax is as follows:

UPDATE yourTableName
SET yourDateColumnName=SUBDATE(yourDateColumnName,INTERVAL 9 YEAR);

To understand the above syntax, let us create a table. The query to create a table is as follows:

mysql> create table ChangeYearFrom2020To2011
   -> (
   -> Id int NOT NULL AUTO_INCREMENT,
   -> ExpiryDate date,
   -> PRIMARY KEY(Id)
   -> );
Query OK, 0 rows affected (0.67 sec)

Insert some records in the table using insert command. The query to insert record is as follows:

mysql> insert into ChangeYearFrom2020To2011(ExpiryDate) values('2020-09-12');
Query OK, 1 row affected (0.19 sec)
mysql> insert into ChangeYearFrom2020To2011(ExpiryDate) values('2020-12-21');
Query OK, 1 row affected (0.17 sec)
mysql> insert into ChangeYearFrom2020To2011(ExpiryDate) values('2020-01-29');
Query OK, 1 row affected (0.12 sec)
mysql> insert into ChangeYearFrom2020To2011(ExpiryDate) values('2020-06-30');
Query OK, 1 row affected (0.19 sec)
mysql> insert into ChangeYearFrom2020To2011(ExpiryDate) values('2020-12-31');
Query OK, 1 row affected (0.13 sec)

Display all records from the table using select statement. The query is as follows:

mysql> select *from ChangeYearFrom2020To2011;

The following is the output:

+----+------------+
| Id | ExpiryDate |
+----+------------+
|  1 | 2020-09-12 |
|  2 | 2020-12-21 |
|  3 | 2020-01-29 |
|  4 | 2020-06-30 |
|  5 | 2020-12-31 |
+----+------------+
5 rows in set (0.00 sec)

Here is the query to change only year from 2020 to 2011:

mysql> update ChangeYearFrom2020To2011
   -> set ExpiryDate=subdate(ExpiryDate,interval 9 year);
Query OK, 5 rows affected (0.20 sec)
Rows matched: 5 Changed: 5 Warnings: 0

We will now check all the records of the table once again. The query is as follows:

mysql> select *from ChangeYearFrom2020To2011;

The following is the output:

+----+------------+
| Id | ExpiryDate |
+----+------------+
|  1 | 2011-09-12 |
|  2 | 2011-12-21 |
|  3 | 2011-01-29 |
|  4 | 2011-06-30 |
|  5 | 2011-12-31 |
+----+------------+
5 rows in set (0.00 sec)