YiortiYiorti (Γιορτή) means "nameday". For Greeks and many Orthodox Christians, your nameday matters as much as your birthday. Missing a friend's is easy, because the dates follow the church calendar and nicknames hide the real name.
Yiorti knows the namedays of the Greek (new and old calendar), Armenian, Bulgarian, Romanian, Albanian and Ethiopian churches, with more coming. It understands nicknames and spellings: Giorgos, Yiorgo, George and Γιώργος are the same person.
A wrong nameday is worse than none. Dates we haven't double-checked carry a small ?. See a mistake? Tell us.
A phone app is on the way.