Change in-game Date?
 

Is it possible to change the in-game date? I had to resupply at a u-tender in the Atlantic. It bothers me that supposedly I lay alongside the 'Ems' for 3 weeks in the middle of the open ocean. I was of the opinion that resupplying at u-tenders usually didn't last longer than 24 hrs. Interestingly when I previously resupplied with 'Bessel' in Vigo I sailed after only 24 hrs. Also, unrealistically I got 11 torpedoes and a full fuel bunker. Wouldn't it be more realistic to maybe get 3 torpedoes and 50% of a full fuel tank?

This is under the LSH3 v15 mod.

Sure, the in-game date must be written in the savegame meaning it can be changed. But you need to be in port otherwise the game will not like it...
For not messing everytime with the savegames you can use SH3 Commander to set exactly how many days you want to be in the bunker. Maybe try to set a time backwards with it to see if it works, you need to use its config files if the menu doesn't allow for negative values, I don't think it works though and you need to edit the saves directly.

For realism, I don't know, I don't care too much so I hope others will jump in here. Besides: changing date is not realistic :)

H.sie patch fixes this. I believe Steibler does it too. Then you don’t have change the date.

I believe SH3 Commander also changes the time-in-base to one day when resupplying at a milch kuh.

I am using the h.sie patch, and it worked when I resupplied at 'Bessel'. For some reason it didn't work with 'Ems'.

There is an U-Tanker fix. If not installed, look in the 3rd Post in Sticky Main Thread. There you will find an "LSH3-V15-BugFix_HSIE_UTANKER_2016-07-29.EXE" and its instruction.