Like Buffz and Sura stated above, registration times open randomly.
Why doesn't it open at certain times?
Ehem ehem...Well,
Example:
American kid: It opened at 2:42 AM on Friday.
German Kid: No, It opened at 1:20 PM on Friday!
See? It's the matter of time zones. Because of FeralHeart being a world wide animal MMORPG, there are people from all sorts of time zones. So if it did open at certain times (For example 2 PM) no one would know which time zone it would open in. I hope that explained it, I'm afraid I can't say anything else about registration times, other than that it was open a few minutes ago. xD