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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