it is i went to school with a set of identical twins and they had different birthdays. nowadays, one has a kid and almost died from an OD, the other got fat
More common than you think. My mom was a member of the Twin club, cause she had a pair of twins, and there were at lest two other moms who had twins with different birthdays.
Sounds like it'd be pretty common tbh, 24 hours a day Twins being born at an average of 17 minutes apart according to first google result because **** it I don't really care that much that's a 17 minute window per 1440 minutes a day about a 5% mean chance.
Actually cool story, here in Macedonia there was a case like that BUT with the added bonus of 1 of the twins being born on 31.12.2015 at 11.59PM and the other one on 01.01.2016 at 00:02 am. So even tho they are twins, they have different YEARS of birth.
In Sweden a pair of twins were born one just before and the other just after midnight on new years eve so not only do they have different birthdays but they were also born on different years!
It has definitely happened. The really fun cases would be the twins born in different months, and even better, different years because of the time delay. There has also been cases where they have extended differences when one twin is birthed early and the other remains in the womb to be born later.