DATETIME

A date and time combination. The supported range is '1000-01-01
00:00:00' to '9999-12-31 23:59:59'. MySQL displays DATETIME values in
'YYYY-MM-DD HH:MM:SS' format, but permits assignment of values to
DATETIME columns using either strings or numbers.

URL: http://dev.mysql.com/doc/refman/5.0/en/date-and-time-type-overview.html

