How does combined birthday work?
The program adds up age n days for all the ages in the calculation, then convert this into years. For rxample, 4 firends who are 25 years old, celebrate 100 combined birth.
The date of your 100th COMBINED BIRTHDAY falls on 24 Jan 2013
It is going to happen in 12.57 days.
Your total combined age is 99 years and 328 days.
Total combined days: 37217.
Did you programme the calculator yourself?
I work hard on it but I can not do it on my own, because I only know some simple things using html. You can find more information on my blog
How do they know what day I was born.
It is pretty easy actually. The web site is programed in PHP which is a program that works itself converts date of birth do day of week.