Selected Jewish Observances
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You can obtain the civil dates for Rosh Hashanah, Yom Kippur, the first day of Succoth, the first day of Hanukkah, the first day of Pesach, and Shavuot for a given year by typing the year (360 C.E. or later; 360 C.E. corresponds to A.M. 4120) in the space below and clicking on the "Find dates" button.


The observances begin at sunset on the previous day.

Observance Jewish Calendar Date
Rosh Hashanah (Jewish New Year) Tishri 1
Yom Kippur (Day of Atonement) Tishri 10
First Day of Succoth (Feast of Tabernacles) Tishri 15
First Day of Hanukkah (Festival of Lights) Kislev 25
First Day of Pesach (Passover) Nisan 15
Shavuot (Feast of Weeks) Sivan 6


The count of years begins with 1 Tishri A.M. 1 (Anno Mundi), which corresponds to Monday, 7 October 3761 B.C.E. (proleptic Julian calendar).

This application assumes that the changeover from the Julian calendar to the Gregorian calendar occurred in October of 1582, according to the scheme instituted by Pope Gregory XIII. Specifically, for dates on or before 4 October 1582, the Julian calendar is used; for dates on or after 15 October 1582, the Gregorian calendar is used. For all dates, the first day of the calendar year is 1 January.

For more information about the Jewish calendar, please see our Information Center page.

See Introduction to Calendars for other calendars.

For further information on calendars, see Richards, E.G. 2012, "Calendars," from the Explanatory Supplement to the Astronomical Almanac, 3rd edition, S.E Urban and P.K. Seidelmann eds., (Mill Valley, CA: University Science Books), Chapter 15, pp. 585-624.

Application Programming Interface

This data service uses one of our new Application Programming Interfaces (APIs). The API returns data in JavaScript Object Notation (JSON) format for users who wish to manipulate data into a customized format. For more information on the API, please see the documentation page.