You do know that it bases everything on the date you completed your last patrol, right?
The date will be moved forward the 28 days on loading your next patrol. IE, you won't see a date change until your back in the boat.
If 20.dec.40 is the ending date shown, your next patrol should start on, or around, 17.jan.41.
This would make U107 your best candidate as she left for her first (real) patrol on 24.jan.41.
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