Four Popular Calendars

Solar Lunar
Julian   Gregorian
(modern)		   Hebrew   Muslim  
Month Names days Month Names days Month Names days Month Names days
January 31 January 31 Tishri 30 Muharram 30
February 28+1 February 28+1 Heshvan 29-30 Safar 29
March 31 March 31 Kislev 29 Rabi I 30
April 30 April 30 Tevet 29-30 Rabi II 29
May 31 May 31 Shevat 30 Jumada I 30
June 30 June 30 Adar 29-30 Jumada II 29
July 31 July 31 Nisan 30 Rajab 30
August 31 August 31 Iyar 29 Sha'ban 29
September 30 September 30 Sivan 30 Ramadan 30
October 31 October 31 Tammuz 29 Shawwal 29
November 30 November 30 Av 30 Dhu al-Qa'dah 30
December 31 December 31 Elul 29 Dhu al Hijjah 29-30
Total Days 365.25 365.242193     354-355   354-355
Notes:
  • General
    • x + 1 (means month length increases during specified calendar's leap year)
    • x - y (means that month length is periodically changed for lunar alignment)
  • Julian (named after Julius Caesar)
    • solar calendar
    • 365.25 days long (yes, the Romans had leap years every four years)
  • Gregorian (named after Pope Gregory)
    • solar calendar
    • 365.242193 days long, not 365.25 days as most people think.
  • Hebrew
    • lunar calendar
    • year 5743 coincided with September 18, 1982 through August 10, 1983.
  • Muslim
    • lunar calendar
    • year 1396, Muharram coincided corresponded with January 1976.
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Neil Rieck
Waterloo, Ontario, Canada.