SELECT FROM_UNIXTIME(data_field);
mysql> SELECT FROM_UNIXTIME(1196440219); -> '2007-11-30 10:30:19' mysql> SELECT FROM_UNIXTIME(1196440219) + 0; -> 20071130103019.000000 mysql> SELECT FROM_UNIXTIME(UNIX_TIMESTAMP(), '%Y %D %M %h:%i:%s %x'); -> '2007 30th November 10:30:59 2007'
SELECT * FROM table WHERE FROM_UNIXTIME(data_field) = '2009-01-04';