|re: Let me know if there's something I can do to return the favor.|
Actually, there is.
I was able to answer your question based on the specifics posted in your Response # 2. Once you said that the difference was always 4 years, I went straight to taking a guess that it was 1900/1904 date system issue.
So the favor you can do is to send an email/text/IM/snail-mail to any one who will ever post a question to this forum and ask them to make sure they included enough detail in their question so that we can at least have clue as to how to help them.
We see so many questions that are lacking key pieces of information that there is no way to answer them. I don't mind asking for more details if it appears that the poster may not understand the subtleties involved in the solution (such as your question). However, I have to wonder about what the poster expects when they post things like "My computer's not working. Please help."
Here's an actual post to this forum:
Subject: Macros Missing Errors
Body Text: now what?
Would you like to take a shot at answering that one?
So, write that email for me and get it out there.