=DAY(A1)+MONTH(A1)+(ROUNDDOWN(YEAR(A1);-3)/1000)+(ROUNDDOWN(YEAR(A1)-ROUNDDOWN(YEAR(A1);-3);-2)/100)+(ROUNDDOWN(YEAR(A1)-ROUNDDOWN(YEAR(A1);-3)-ROUNDDOWN(YEAR(A1)-ROUNDDOWN(YEAR(A1);-3);-2);-1)/10)+(YEAR(A1)-ROUNDDOWN(YEAR(A1);-3)-ROUNDDOWN(YEAR(A1)-ROUNDDOWN(YEAR(A1);-3);-2)-ROUNDDOWN(YEAR(A1)-ROUNDDOWN(YEAR(A1);-3)-ROUNDDOWN(YEAR(A1)-ROUNDDOWN(YEAR(A1);- 3);-2);-1))
Funguje to vdaka ,