Month Hebrew English Length The Bible Holidays 1 נִיסָן Nisan 30 days Called Abib(Exodus 13:4, 23:15, 34:18, Deut. 16:1) and Nisan (Esther 3:7) in the Tanakh. פֶּסַח Passover 15th-21st of Nisan 2 אִיָּר / אייר Iyyar 29 days Called Ziv in 1 Kings 6:1, 1 Kings 6:37. פסח שני Pesach Sheni  - 1 month after Passover ל״ג בעומר Lag B'Omer  - 18th of Iyar 3 סִיוָן / סיוון Sivan 30 days שבועות or חג שבעות‎ Shavuot - 6th of Sivan 4 תַּמּוּז Tammuz 29 Read more [...]