Hebrew calendar
About the Hebrew calendar
The Hebrew calendar has months of 29 or 30 days tied to the Moon and adds a thirteenth month, Adar I, in years 3, 6, 8, 11, 14, 17 and 19 of each 19-year cycle to keep festivals in their seasons. Common years have 353, 354 or 355 days and leap years 383, 384 or 385. Between about 70 and 1178 CE observation of the new moon was gradually replaced by fixed arithmetic rules, and years are counted anno mundi from a traditional creation date in 3761 BCE.
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