Which day you celebrate as the birthday ?The question may seem to be absurd. Birthday is definitely the day on which one is born. But the question is whether it is the date on which one is born or the star on which the birth has taken place. There is no question that for all practical and legal purposes the date has to be followed, which is universally accepted. Most of the people do celebrate that day as birth day.
However, among a certain communities, the annual birthday celebrations are held on the day corresponding to the birth star. In my community the birthday is counted based on the birth star, at the time of birth, appearing in the Malayalam month.
For example in my case I was born on 24th February. In the calculation based on Malayalam almanac this day is to be taken as the Pooyam (Pushyami) nakshathra of month Kumbha. We celebrate annually this day as birthday. Officially for all purposes the month February and date 24 are being used.