It is exactly reverse of UNIX_TIMESTAMP() and can be done with the help of FROM_UNIXTIME() function. For example, 11576070 seconds would be TIMESTAMP ‘1970-05-15 05:04:30’.
mysql> Select FROM_UNIXTIME(11576070); +--------------------------------+ | FROM_UNIXTIME(11576070) | +--------------------------------+ | 1970-05-15 05:04:30 | +--------------------------------+ 1 row in set (0.00 sec)