Calendrical calculations

Nachum Dershowitz*, Edward M. Reingold

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A unified, algorithmic presentation is given for the Gregorian (current civil), ISO, Julian (old civil), Islamic (Moslem), and Hebrew (Jewish) calendars. Easy conversion among these calendars is a byproduct of the approach, as is the determination of secular and religious holidays.

Original languageEnglish
Pages (from-to)899-928
Number of pages30
JournalSoftware - Practice and Experience
Issue number9
StatePublished - Sep 1990
Externally publishedYes


  • Calendar
  • Gregorian calendar
  • Hebrew calendar
  • Holidays
  • ISO calendar
  • Islamic calendar
  • Julian calendar


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