I started playing at WIS on November 13, 2001. Started out with SIM teams but once I tried HBD I never looked back. Is there any way to find a date for my 1st HBD team/world?

If it's a shuttered world I don't believe so. If it's a world that still exists you can look through your team history on your owner profile page. Just doing a quick browse, it looks like the earliest your teams that are in an active world goes back is S1 of Fiz in 2006. Might be SOL

HBD was released to the public in early 2006.

I've had my Honolulu franchise in Griffey since the world was created and there are times I've wondered exactly when it started. The best I can guess it was mid - June 2006. I look at my teams stats from season 1 and just click on random players and look at the transactions tab. The earliest transaction I notice is a contract extension at June 18, 2006 at 3:11 AM. I also look at the trades history from the world and the first trades were completed June 18, 2008 and 3:03 PM. Since there is the review period they had to have been accepted on the 17th, and the days to set budgets around 15/16 on June, 2006.