The Hebrew calendar is a lunisolar calendar used for Jewish religious purposes. The calendar tries to match both the lunar months and the solar year. Since this task is quite complicated, the calendar rules is complicated too (see below the calculators). Use the following calculators to convert Gregorian dates and Hebrew dates.
The inverse conversion:
The Hebrew calendar rules
The Hebrew year consists of 12 months in a common year and 13 months in a leap year. The additional 30-day month (Adar I) is inserted before the 29-days (Adar II) every 3,6,8,11,14,17,19 year of the 19-year cycle. The length of 8th and 9th months varies from 29 to 30 days according to the complex criteria, which is fully described in the book1 or wikipedia2. A new Hebrew year begins on the 1st of 7th month (Tishri). Unlike Gregorian calendar, a Hebrew day begins on sunset, so you should allow one day correction if the calculation is performed for the period of time between sunset and midnight.
The Hebrew calendar summary
|Days in a year||365.2468|
|Effective date||9th century CE|
|Epoch (Julian)||October 7th, 3761 BCE|
|Days in a week||7|
|Days in a year||353-355, 383-385|
|Days in a month||30, 29|
|Leap year||every 3d, 6th, 8th, 11th, 14th, 17th, 19th year is leap|
|12, Adar I||30|
|13, Adar, Adar II||29|