A easy simple perpetual annual calendar free application that displays the year of this year and the next year for each year. Change the year with left and right button. Switch the first day of the week between Sunday or Monday. Highlight today's date. Display monthly week number. Set your own holidays with year / month / day (YYYYMMDD) or month / day (MMDD) designation. For multiple national holidays, constipation, menstruation and the full moon.