When I change the date, in the garden log, (either backward or forward), it will change back to the current day.

I wanted to enter some items I completed before Gardenplaner, but can not change the date.

I saw this yesterday too.
This is another item that should be easy to fix tomorrow and we should have a release out that takes care of the problem.

New user - having the same problem; date reverts to today's date. Thank you!