Help with Days in Base and The Like

[Reinhard Dietz]

Here's the deal:

I'm heading back to St. Nazaire and will arrive during the second week of December 1940. The boat's undamaged, but I want to trade my very lucky VIIB for a brand-new IXC when I immediately transfer from the 7th to the 2nd at Lorient.

If I understand the relevant data files in SH3C right, the IXC becomes available in January of 1941, so I need to spend at least a month in base after the transfer to the 2nd in order for it to be available on the U-boat panel, correct? If that's the case, what kind of SH3C-fu do I need to perform? I suppose it's choosing "Set number of days spent in base to" and entering something like 30. When would that be set, right before I load the save where I'll finish the current patrol in St. Nazaire?

Any advice is appreciated, and I hope I've clearly expressed what it is I'm trying to do. I also need to nudge the ol' renown upwards so that I don't lose my recently-acquired rank of Kaleun; it's appropriate to do that with the 'In port before mission' save, correct?