I have a real problem related to this. I paused my game for a couple of days, because I was tired of losing track of my villagers. I made the mistake of checking a date ahead on my computer calendar. Now I have one tribe who will be without new crops for 20,000 give or take hours and I have quit and restarted several times trying to fix it. I don't know what to do!
Try pausing your game and setting the system clock back to the time this happend. But be careful, even this may damage your game even more.