Is Debbie's birthday in November sometime, just to split the difference or what?🤔 (Ps, sorry for the bad quality TV pix)

In season 2: EP:4 - A beautiful mess, Debbie says her birthday isn't until October, but in season 7 episode 9 - Ouroboros, she reminds Monica her birthday in fact isn't in the summer like Monica thought but rather in December.

So when tf is it? 🤔