If the next day is when Naruto is going to turn 17, then shouldn't Sasuke and most of the other Konoha 11 members already be 17 (or 18 in Lee and Tenten's cases)? I mean, at the very least we know for a fact that Sasuke is older than Naruto because we saw him as a baby when Kushina was pregnant with Naruto. Besides that, I looked up all of the K 11 birthdays on the wiki and all of their birthdays are before Naruto's except for Lee and Hinata ( and Lee's birthday is irrelevant because it was already established that team guy was older than the rest). This means that unless team guy is actually 2 years older than most of the rookie 9 and Naruto is secretly a year older than the other rookie 9 members, everyone in Konoha 11 except Hinata should be older than Naruto. I just bring up this point because the wiki people did not change anyone's age. P.S. Interesting Fact: Tenten is the oldest Konoha 11 member while Hinata is the youngest.