It does not always happen like this, but from what I see? The "Command" runs from 1941-03-01 to 1944-08-30, with Base 1 being Kiel from 1941-03-01 to 1941-10-01, which it then moves to La Pallice 1941-10-02 to 1944-08-30. Now, for me, the game does not document when that "1941-03-01" begins... I have seen mention of "midnight" from reliable sources, but that is kind of a "which one" question? When military counting though, 0000 for midnight, is the first stroke of the new day, so 0000 1941-03-01 is at the first moment of that day, at 0000 hours. Likewise with 1944-08-30... you go from 2359:59 and however many milliseconds you want to count on 1944-08-29, and then right at 0000:00 hours it is 1944-08-30. I beat this point beyond the point of 'dead' at 0000 hours, because at exactly that same time, you have the VIIC:
[Flotilla 5.UserPlayerUnitType 1]
ID= F5VIIC
NameDisplayable= Type VIIC U-boat
AvailabilityInterval= NULL, NULL <--- Basically 1941-03-01, 1944-08-30
IDLinkUserPlayerUnitType= VIIC
UnitTypeCommonality= 5
IDFlotillaLinkTransferTo= 11Flotilla_BERGEN
which just so happens to 'die' at that same exact moment in time of 0000:00 hours on 1944-08-30... my thought is that the Command should be until 1944-08-31, and the same that the Base 2 of La Pallice should be 1941-10-02 to 1944-08-31, but making the sub NULL, 1944-08-30, so that the "IDFlotilla Link TransferTo= line actually gets a chance to kick-in and be utilized. It seems like it should fuction correctly anyway, but we have found the same issue in FotRSU with the newest update, and ran into a boat without a home more than once during testing. Not cool, and very difficult to "fix" in the Save folder, if it is even possible... I tried editing the Save folder data, but I always mess that up. I would look in the CareerTrack, find the lines, and then search for the hits elsewhere. But in the meantime, unless a boat is purposefully set to expire for a game default upgrade path to the next higher boat, I would make certain all boats transfer out prior to the Base and / or Command expire by at least a 24 hour period of time...