I just wrote a post I want to schedule to be published at 21 of March 2012, at 00:01. It´s impossible. Something crashed on WordPress, and I cannot see the date, year or time I chose, neither is their any “schedule” button.
I have the same problem right now and sent a message to support. Guess I won’t be getting a response any time soon:/. But, just so you know, the schedule fields are just truncated for some reason. If you put your cursor in the little boxes, double click and delete and then type what you want, it will work. You just won’t be able to see what you typed to verify that it is right. But, I did it last night to schedule a post for 7 a.m. this morning and it worked. Thought this might help some over the weekend. Good luck.