As of now the ADR window is permanently 90 days instead of 180 days. To determine your date you can click here
http://www.wdwinfo.com/wdwinfo/dinin...dispscalc.html
This is a permanent change to the Dining System. Reported information from Disney's intranet confirms this for us.
According to Disney due to the growing pattern of guests finalizing their itineraries closer to their vacation experience they are permanently adjusting their reservation windows to 90 days. This includes Dining Reservations, Dining Package Reservations (Fantasmic! and Candlelight Processional), Recreation Reservations and Tour Reservations.
There is a temporary exception to the 90 day rule. CRT, Chef Mickey and Victoria & Albert's can apparently be booked up through June 19th 2009. This is a fixed date, and as soon as it's 90 days prior to June 19, they will be on the same 90 day schedule as all other locations.
Grand Gathering Experiences* and La Nouba can be reserved up to 180 days in advance.