How to round a DateTime in MySQL?

Question

I want to discretize the DateTime with the resolution of 5 minutes. I did it in C#, but how to convert the following code to MySQL?

DateTime Floor(DateTime d         


        

Answer 1

Here is another variation based on a solution from this thread.

SELECT DATE_ADD(
           DATE_FORMAT(time, "%Y-%m-%d %H:00:00"),
           INTERVAL FLOOR(MINUTE(time)/5)*5 MINUTE
       );

This solution, unlike ones that use FROM_UNIXTIME, will give the expected value for datetimes that fall within daylight saving time (DST) transitions. (Compare for example 2012-11-03 2:14:00)

Edit - After some quick benchmarking, however, Ollie's first solution appears to perform faster than this. But I still recommend against the FROM_UNIXTIME method.