This free Excel calendar template allows you to quickly and easily create and print a monthly calendar by simply choosing a year and month. You can also choose a color scheme for your calendar using simple form controls. Use the ready-made 2009, 2010, 2011, or 2012 calendar workbooks for adding events and holidays, planning, printing, and scheduling. Version 1.4.2 includes calendars for 2013 and 2014 as well as additional holidays and religious observances.
Second, the synodic month does not fit easily into the year, which makes constructing accurate, rule-based lunisolar calendars difficult. The most common solution to this problem is the Metonic cycle, which takes advantage of the fact that 235 lunations are approximately 19 tropical years (which add up to not quite 6940 days). However, a Metonic calendar (such as the Hebrew calendar) will drift against the seasons by about 1 day every 200 years.