You really had me worried there torpedobait... Remember that the game does dates differently in just about all of the areas of the game. Some places, they go mmddyyyy, other places, yyyymmdd, other places ddmmyyyy, as above, so you are seeing "second day of the first month, in the year 1943", which would be January 2nd, 1943 to a Yankee...
Just to let you know, that Miyoka Harbor issue you found is much much more than just Miyoka Harbor... We have discovered another Bermuda Triangle area in the game!... - If nothing else, we have a quick-fix to use, but we are attempting to rectify the situation in a proper manner. We had all of our ducks in a row when we split the Jap_HarborTraffic file into "layers", but the game has a unique way of dealing with RndGroups that are numbered above 777... they just up and disappear, unless they are part of the Jap_HarborTraffic file, which apparently has magical powers beyond mere mortal comprehension... There must be a special place in Silent Hunter 4: Wolves of the Pacific for that file...