@007JulienJun 24.2011 — #See mktime() witch get Unix timestamp for a date. This timestamp is a long integer containing the number of seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time specified.
@NogDogJun 24.2011 — #Not exactly sure what you want to convert to what, but MySQL has the FROM_UNIXTIME() and TO_UNIXTIME() functions for doing UNIX timestamp conversions in the SQL itself.