Approx equivalence. Will be updated.

        Hebrew 	Number 	Length 	       Civil Equivalent
Nissan 1 30 days March 20 - April 19 Iyar 2 30 days April 20 - May 19 Sivan 3 30 days May 20 - June 20 Tammuz 4 30 days June 21 - July 20 Ab 5 30 days July 21 - August 20 Elul 6 30 days August 21 - September 21 Tishri 7 30 days September 22 - October 21 Cheshvan 8 30 days October 22 - November 21 Kislev 9 30 days November 22 - December 20 Tevet 10 30 days December 21 - January 20 Shevat 11 30 days January 21 - February 20 Adar 12 30 days February 21 - March 19

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