>PS: If we had concrete rules we could calculate in any language. ie: Can you tell me: How many days = 3 months? (I don't have an answer, all I know it's 89-92 days).
Cetin

Of course, there're no concrete rules. And I couldn't even answer how many days a person was old celebrating his 50th birthday on 28 February 2006. Nevertheless, people somehow manage it, and I believe, that the person on that day was really 50 years 0 months 0 days old:)

Regards,
Sergey