def queryOffset(self, request, 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):
        return rows[0][0]

d = defer.maybeDeferred(lambda:None)
d.addCallback(self.queryOffset, userId)
offset = d.addCallback(self.getOffset)
print offset
mktimestamp = lambda x: DateTime(2005, 5, 1 + x / 48, (x % 48) / 2, (x % 2) * 30) - DateTimeDelta(0,offset)