Your personal Tumblr journey starts here
I'm not sure if Nora has discussed the answer to this before, but which birthday does Neil use after his identity is made legal? Which one did the fbi put on his new ID and passport and stuff?
I recall that in the extra content Nora responded to an ask related to this saying that the 'crazy' party Dan wanted to do for him did end up happening in March, but in another she also explained how Neil doesn't really like large gatherings or celebrating things like anniversaries. That party doesn't necessarily designate that as the date he chose or that he celebrates at all, maybe just that the team wanted to plan something for him and that was the day that worked best in the timeline of the aftermath of tkm.
I've seen people post a happy birthday thing for him on both January 19th and March 31st, so it seems as a fandom we consider both accurate, but I wonder which one Neil chose... something to ponder.