every Xth day of year. every second sun of may.
Suggested on Nov 24, 2013 - 12:05
every Xth day of year.
E.g. programmers day is 256th day of the year which is September 13th during common years and 12th of September during leap years.
every second sun of may.
E.g. mother's day is on second Sunday of May (in Ukraine).