Both ways are proper, you could use http://nl2.php.net/date as a php
function, and insert that into the DB, or use the handy mySQL
TIMESTAMP which automatically picks the current date/time when a record
AFAIK, the MySQL timestamp values are also automatically updated when
the database row is modified, which doesn't seem to be what the OP
asked for. I would use a DATETIME field, and the MySQL function NOW().