MYSQL Date Time Round To Nearest Hour

Question

I have a date time field in a MySQL database and wish to output the result to the nearest hour.

e.g. 2012-04-01 00:00:01 should read 2012-04-01 00

Answer 1

To round down to the current hour, select:

FROM_UNIXTIME(FLOOR(UNIX_TIMESTAMP(column_name) / 3600) * 3600).

The value is expressed in the current time zone doc