Earth takes about 365 1/4 days to revolve around the sun As we take 365 days for a year, the difference of 1/4 of a day requires adjustment This is why we add one dayThe Earth takes approximately days to go around the Sun, yet our calendar year is 365 days To fix this, we put on extra days in some years, called leap years Every 4 years, we have a leap year to add another day to the calendar to make up for the 4 missing quarters In those leap years, a year lasts 366 days, and not the usual 365This website shows every (annual) calendar including 21, 22 and 23 This can be very useful if you are looking for a specific date (When there's a holiday / vacation for example) or maybe you want to know what the week number of a date in 21 is You can also use this site to find out when a particular day or date in 21 takes place
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