def queryOffset(self, userId):
         query1 = 'select timezone.gmtoffset from timezone, person where \
                  timezone.id = person.fk_timezone and person.id = %d'                
         return self.db.db.runQuery(query1, (userId, ))

def getOffset(self, rows, x):
        return DateTime(2005, 5, 1 + x / 48, (x % 48) / 2, (x % 2) * 30) - DateTimeDelta(0, rows[0][0])

d = self.queryOffset(userId)
d.addCallback(self.getOffset)
return d