Just FYI, I came home to day and ran a quick test with my 1533 connected my router. The DAP isn't getting correct time using NTP server, even if the DAPs IP address placed into the main routers DMZ. Seems to be a problem. I've passed this along to D-Link to see if they will review and give some info.
I highly recommend that you phone contact D-Link support and advise them about this so they have notice of other users with this problem and can start tracking it. I can't guarantee any thing on my end. At least I've notified them. Please be patient.