If you changed the clock, and didn't already have the offset nullified, theres not a ton you can do, as I'm still not entirely sure how the part of the save that fixes it works, I know its possible to fix, as I've done it before, but, its really hard to explain. If you've nullified your consoles offset before, try nullifying it again.. If you've homebrewed your system, theres a good chance you've done it before. Its in the Rosalina menu. Whenever I get a bit less busy I'm hoping to make a version of the mod where this lockout can't happen at all.
If that doesn't work, please back up your save file with checkpoint JKSV, or whatever before you start over if you do so, cause if I can fix this in the future, it will be good to have that ready.