MONTHS OF THE PRINCIPAL CALENDARS
GREGORIAN1		JEWISH		ISLAMIC
Name	Days	Name	Days	Name	Days
January begins 10 days after the winter solstice	31
Tishri in the year 5753 began Sept.28, 1992	30	Muharram4 in A.H. 1413 began July 2,1992	30
February in leap years	28 29	Heshvan	29 or 30	Safar	29
March	31	Kislev	29 or 30	Rabi I	30
April	30	Tebet	29	Rabi II	29
May	31	Shebat	30	Jumada I	30
June	30	Adar2	29 or 30	Jumada II	29
July	31	Nisan3	30	Rajab	30
August	31	Iyar	29	Sha'ban	29
September	30	Sivan	30	Ramadan	30
October	31	Tammuz	29	Shawwal	29
November	30	Ab	30	Dhu'l-Qa'dah	30
December	31	Elul	29	Dhu'l-Hijja in leap years	29 30

¹The equinoxes occur about March 21 and September 23, the solstices about June 22 and December 22.
²In leap years an intercalary month of 30 days takes the place of Adar, and is sometimes called Adar I. Adar then becomes the 29-day Veadar or Adar Sheni (sometimes called Adar II), and retains the usual festivals and holidays of Adar.
³The first month of the ecclesiastical year; anciently called Abib.
⁴Retrogresses through the seasons; the Islamic year is lunar and each month begins at the approximate new moon; the year 1 A.H. began on Friday, July 16, A.D. 622.