Hebrew Calendar Calculator

Note on dates: Western dates until 4 October 1582 CE (18 Tishri 5343 AM) are reckoned according to the Julian calendar. Dates from 15 October 1582 CE (19 Tishri 5343 AM) are reckoned according to the Gregorian calendar.

Note that this calendar calculator is based on the current rules of the Hebrew calendar which, according to tradition, were first introduced in the fourth century CE but were not generally followed until after the tenth century CE.

Main Character of the Hebrew Year

Main Character of the Hebrew Year   Anno Mundi
Common Era   Era of Contracts   Era of Destruction   Year in sabbatical cycle
[Abraham ibn Ezra / Maimonides]
       
New Year Molad   Weekday
New Year Molad
  Postponement
rule for 1 Tishri
  Postponed
days
  Weekday 1 Tishri
       
Year in 19-year cycle   Year in 28-year cycle   Year type (Kevia’ah)   Year length   Weekday 15 Nisan
       

The year can be changed to any other year by clicking on the ±1, ±10, ±100 and ±1000-year buttons until the desired year is displayed.

In addition, there are buttons for adjusting the year in 19-year intervals (Metonic cycle) and 28-year (solar cycle) intervals.

Buttons for larger intervals of 247 years, traditionally attributed to the 9th-century gaon Nahshon bar Zadok, and 4104 years are also provided. These intervals are near-repetition periods of the Hebrew calendar after which the principal festivals (nearly) always fall on the same weekdays. Note that after each of these cycles the New Year molads progressively decrease by 905 parts (about 50 minutes) or 1080 parts (exactly 1 hour).

The year in the sabbatical cycle is given according to the reconstruction of this seven-year cycle from post-exilic sources proposed in 1857 by Benedict Zuckermann. Other reconstructions, notably that proposed by Beth Zion Wacholder (1973, 1975, 1983), suggest that the sabbatical year should be one year later. When seven sabbatical cycles were completed, a so-called jubilee was announced. Here it is assumed to correspond with the first year of a new 49-year cycle.


Hebrew Holy Days and their Equivalent Dates in the Western Calendar

Hebrew Holy Days and their Equivalent Dates in the Western Calendar
Holy Day Hebrew date Weekday Calendar date
Rosh haShanah
(New Year)
1st day   1 Tishri
2nd day   2 Tishri
Ẓom Gedalyah (Fast of Gedaliah)  Tishri
Yom Kippur (Day of Atonement) 10 Tishri
Sukkot
(Tabernacles)
1st day 15 Tishri
Ḥol Hamoed (1st intermediate day) 17 Tishri
Ḥol Hamoed (last intermediate day) 20 Tishri
Hoshana Rabba (Festival of Willows) 21 Tishri
Shemini Atzeret (Closing Holiday) 22 Tishri
Simḥat Torah (Rejoicing of the Law) 23 Tishri
Ḥanukah
(Festival of
Dedication)
1st day 25 Kislev
Last day  Tevet
Asara Ba’ Tebeth (Fast of Tevet) 10 Tevet
Ḥamishah Asar/Tu Ba’ Shebat (New Year of the Trees) 15 Shevat
Ta’anit Esther (Fast of Esther)  Adar 
Purim (Feast of Lots) 14 Adar 
Shushan Purim 15 Adar 
Ta’anit Ba’ Chorim (Fast of the First Born)  Nisan
Pesach
(Passover)
1st day 15 Nisan
Sefirat ha-Omer (1st day of Omer) 16 Nisan
Ḥol Hamoed (1st intermediate day) 17 Nisan
Ḥol Hamoed (last intermediate day) 20 Nisan
Last day (7th day of Omer) 22 Nisan
Lag Ba’ Omer (33rd day of Omer) 18 Iyyar
Shavuot
(Festival of Weeks)
1st day (50th day of Omer)   6 Sivan
2nd day   7 Sivan
Shiv’ah Asar Ba’ Tammuz (Fast of Tammuz)  Tammuz
Tisha Ba’ Av (Fast of Av/Destruction of the Temple)  Av

Moladot for the Months of the Hebrew Year

Moladot for the Months of the Hebrew Year
Tishri   Nisan
Ḥeshvan   Iyyar
Kislev   Sivan
Tevet   Tammuz
Shevat   Av
Adar    Elul
Adar    Tishri

The Seasonal Quarters of the Year (Tekufot)

The Seasonal Quarters of the Year (Tekufot)
Tekufot according to Mar Samuel Yarhinai (based on a year of 365d 6h)
Tekufah Tishri (autumn equinox)
Tekufah Tevet (winter equinox)
Tekufah Nisan (spring equinox)
Tekufah Tammuz (summer equinox)
She’elah (Prayer for Rain)    
Kiddush Haḥamma (Blessing of the Sun)    
Tekufot according to Rav Adda b. Ahavah (based on a year of 365d 5h 997p 48r)
Tekufah Tishri (autumn equinox)
Tekufah Tevet (winter equinox)
Tekufah Nisan (spring equinox)
Tekufah Tammuz (summer equinox)
She’elah (Prayer for Rain)    
Kiddush Haḥamma (Blessing of the Sun)