I've noticed that my DST setting had no effect this last Sunday, March 8th. So, while using NTP I had to set my timezone from EST (GMT-5) to AST (DMT-4) to "spring ahead" an hour - friends had the same issue.
I had tried setting DST ON and set to USA - no good.
Did DLINK not update DST for the new times starting the last year or so ago?