A few bugs for you:

If you navigate back in time with both finances and messages and do not return to your position, you can jump to the future too, then you continue forwards from that date through the days you have already gone through.

Also, by the second year, 3rd month I got a tithe request and went to check my finances. They 'capped' at year 1 month 3, so I couldn't tell what my current rate of production was. So I went back, and my date was reset to year 1 month 3, but I cannot move forwards again and ending my turn simply reprocesses that specific month indefinately.

Otherwise it looks pretty good.