Board Thread:False Info and Speculative Discussion/@comment-24447558-20140701205038/@comment-13965604-20140701214031

The calendar is not canon. It's not retconnned, its just shoddy work. Derek Hale's birth day is 11-7-88 unless they bring up in the show that that was a fake ID, which isn't terribly likely.

I also doubt we will see anything else about it. I can't see there being a reason to bring up his middle name in the show.