I'm guessing your ADR 180 date is May 13th which means you can start booking this morning at 6am online or 7am by phone.
The reservation system might be down because December dates are probably going to be added on Monday.
Hope you get the ADR's you were hoping for!
I noticed on another forum that the WDW reservation site will be down until tonight. They are apparently updating their sites. Sorry, but looks like there's nothing you can do today. Try phoning first thing tomorrow. Good luck.