Was möctest du genau machen?
Falls es um Datums umwandlungen geht:
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mysql> SELECT TIMESTAMPADD(MINUTE,1,'2003-01-02');
-> '2003-01-02 00:01:00'
mysql> SELECT TIMESTAMPADD(WEEK,1,'2003-01-02');
-> '2003-01-09'
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zu finden auf
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_timestampadd
gruss