ShareDay is a fun and addicting app that finds the exact day in between any two birthdays.
Simply add names and birthdates to your list of friends, then just click two names to find a Share Day.
Share Days are often coincidentally the same as other friends and relatives birthdays, anniversaries, and other historical dates and holidays... so find some Share Days today and prepare to be amazed!
Notes From Developer:
You may find that the Share Day for two close dates is far away and apparently random... As an example, although the Share Day for January 1st and January 3rd is January 2nd, the Share Day for January 1st and January 4th is July 4th! This is because the day in between the 1st and the 4th cant be January 2 1/2, so Share Day looks in the opposite direction to find the exact day in between the two dates.