When was Joseph born?

Adam was created on day six of year zero; I'm sure of it. I don't know when Cain or Abel were born (and I won't speculate), but I don't feel bad about this, though, because God's plan was to follow Seth (who was born in year 130 - Gen. 5:3). So, here I've shown how I establish event dates. Adam in year zero, Seth when Adam was 130 years old and Adam's death in year 930 (Gen. 5:5). This approach works wonderfully all the way up to Noah in 1056. The first bit of confusion comes with Noah's children somewhere around 1556. The only way to not be confused here is to assume that Shem, Ham and Japheth were triplets (Gen. 5:32). I dunno about that.

I'm not ready to assume Mrs. Noah's multiple births because of Arphaxad's birth (Gen. 11:10). Arphaxad was born two years after the flood when Shem was 100 years old. How could Shem be 100 years old two years after the flood unless he was 98 when the flood ended. The difficulty arises when you remember that Noah was 500 when the boys were born and 600 when the flood started (Gen. 7:6,11). This works out to them being 100 when the flood started, unless they weren't actually triplets. So, I have to leave a question mark in the spreadsheet for this event.  I don't mind this at all.  Like I said in my first post I expect this sort of thing, and worse!

So, when was Joseph born?  The Bible doesn't tell us directly, but it does tell us that:

1. Joseph was 30 yrs old at the beginning of the seven good years. (Gen. 41:46)
2. Jacob was 130 yrs old when he arrived in Egypt (during the 2nd famine year - Gen. 47:9).
3. So, Joseph was 39 yrs old when Jacob arrived (7 good years + 2 bad).
   
4. This puts Joseph's birth when Jacob was 91 y/o.
   

Jacob and Esau were born in around 2106, so this puts Joseph's birth in 2197.  Wasn't that fun?