Is this Date Constraint format correct?

[mwh2]

Thanks in advance to anyone that can look at this code and tell me if I'm missing any thing. I can't get it to work.

$this->constraints .= "vehicle_reservations.start_date NOT BETWEEN '".$dates[0]."' AND '".$dates[1]."' AND
vehicle_reservations.end_date NOT BETWEEN '".$dates[0]."' AND '".$dates[1]."' AND ";
(vehicle_reservations.start_date IS NULL AND vehicle_reservations.end_date IS NULL)) AND";

Thanks,
Mh

 

[ascikey]

Not really my area but you seem to have 2 closing brackets and only one opening bracket also there is an AND at the end but nothing there 2 and ? I think