Because today does not exist! February 29: who ever heard of such a thing? I think it's a joke, black magic (magick?), possibly some sort of conspiracy. What does it mean? Do green lights mean stop and red mean go? Am I my mother's daughter's daughter's mother? Where does it stop? As far as I'm concerned today is actually March 0 and I'll just wait for 1 to roll around because to go out there and mix with all off that is just tempting the fates.
And don't even mess with people who claim that today is their birthday. They are changelings, possibly elves or faeries and only want to injure you with trickery and possibly spirit you back to their secret land at midnight tonight.
Best to stay away, stay away from it all.