Update only Time in a mysql DateTime field

Question

How can I update only the time in an already existing DateTime field in MySQL? I want the date to stay the same.

Answer 1

UPDATE myTable
SET myDateTime = ADDTIME(myDateTime, @myTimeSpan)
WHERE id = @id;

For exact syntax of function, see this.

Answer 2

Try this:

UPDATE yourtable 
SET yourcolumn = concat(date(yourcolumn), ' 21:00:00')
WHERE Id = yourid;

Answer 3

UPDATE `table`
SET time = ADDTIME(time, INTERVAL 13 Hour);

Answer 4

I have solved in this way:

UPDATE table
SET myDateTime = CONCAT_WS(' ',DATE(myDateTime), CURTIME())
WHERE id = @id;

Obviously you should change CURTIME() with your desired time.

Answer 5

Asuming you have a DATE field and TIME field and want to inject the time into the date, try this:

UPDATE mytable
SET mydatefield = ADDTIME( DATE_FORMAT(mydatefield,'%Y-%m-%d 00:00:00'), mydatefield)
WHERE myid = ...

Answer 6

UPDATE myTable
SET myDateTime = ADDTIME(DATE(myDateTime), @myTimeSpan)
WHERE id = @id;

Documented on MySQl date functions MySQL docs