Front Runner is a member that uses 1x time almost exclusively. He was having daylight (Base Time) issues, especially in an earlier version of Fall of the Rising Sun Ultimate (FotRSU). He made a thread
Base Time 2018, updated in 2019 - but fair warning - Alice's rabbit hole wasn't as big as this one... The subject gets "deep", so take a pair of hip boots if you enter.
Your situation almost sounds like either you are near the Arctic or Antartic Circle, and running under the "endless night" sun... but the game does not do that very well, if you are there... More than likely, you have a configuration issue of some sort, and maybe the Save folder is trashed also. Here's a series of questions for you: Where do you have the game installed on your computer? In other words, what is the path to the game, such as "C:\Program Files..." etc.? Second, which version of the game are you using? You say you have Steam, but is it the "Wolves of the Pacific", or the "Uboat Missions AddOn" you are using modded? Have you attempted to apply the 4Gig Patch or the LAA app to the SH4.exe file? Next, you show TMO and RSRDC mods applied, but have you altered the mod list since you began play? Had you emptied the Save folder after adding or subtracting mods? Answer as best you can, and someone can help further.