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- The number of days between two dates.
- The date of a religious holiday, like Easter (the calculation is known as Computus) or Passover, for a given year.
- Converting a date between different calendars. For instance, dates in the Gregorian calendar can be converted to dates in the Islamic calendar with the Kuwaiti algorithm.
- Calculating the day of the week.
- Edward M. Reingold and Nachum Dershowitz. Calendrical Calculations. Cambridge University Press; 3 edition (December 10, 2007). ISBN 978-0-521-88540-9
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