To change only dates, not time, use the MySQL INTERVAL and YEAR. Since, we will be updating the records, therefore, use UPDATE and set a new value with INTERVAL.
Let us see an example and create a table −
mysql> create table DemoTable ( DueDate datetime ); Query OK, 0 rows affected (0.56 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('2017-08-12 10 :30 :45');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('2015-09-21 12 :00 :00');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('2018-12-31 11 :45 :56');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('2016-01-02 01 :23 :04');
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------------------+ | DueDate | +-----------------------+ | 2017-08-12 10 :30 :45 | | 2015-09-21 12 :00 :00 | | 2018-12-31 11 :45 :56 | | 2016-01-02 01 :23 :04 | +-----------------------+ 4 rows in set (0.00 sec)
Following is the query to change all dates but not the time values −
mysql> update DemoTable set DueDate=DueDate+interval 1 year; Query OK, 4 rows affected (0.16 sec) Rows matched : 4 Changed : 4 Warnings : 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+-----------------------+ | DueDate | +-----------------------+ | 2018-08-12 10 :30 :45 | | 2016-09-21 12 :00 :00 | | 2019-12-31 11 :45 :56 | | 2017-01-02 01 :23 :04 | +-----------------------+ 4 rows in set (0.00 sec)