How does the converter handle Jewish day boundaries?

Each Hebrew calendar day begins at sundown on the preceding civil evening. The tool displays the primary civil date corresponding to the Hebrew daytime portion.

What are the four dehiyyot postponement rules shown in the output?

The dehiyyot are halachic postponement rules (Molad Zaken, Lo ADU Rosh, GaTaRaD, and BeTU-TaKPaT) used to set Rosh Hashanah while preventing Yom Kippur from falling adjacent to Shabbat and Hoshanah Rabbah on Shabbat.

Why do the Torah portions differ between Israel and the Diaspora?

In the Diaspora, an extra day is observed for major festivals, which can turn a regular Shabbat into a festival reading and temporarily offset the weekly parasha cycle until combined portions realign the schedules.

How are Hebrew months numbered when using numeric input?

Numeric Hebrew input follows the religious calendar sequence starting in Nisan (Month 1 = Nisan, Month 7 = Tishrei).

Does this tool calculate local candle-lighting and zmanim times?

No. Local zmanim and candle-lighting calculations require geographic coordinates and local elevation, which are outside the scope of this calendar engine.

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Date & Time

Hebrew / Jewish Calendar Bilingual Date Converter

Converts any date between Gregorian, Julian and the fixed Hebrew calendar: molad of the month, the four dehiyyot postponement judgments, keviyah year type, the weekly Torah portion (parasha) for Israel or Diaspora, the Omer count, the full festival schedule of the Hebrew year and the Anno Mundi era in Hebrew letters.

Details

What this tool helps you do

Enter a date as Gregorian ("2026-04-11"), Julian ("1712-01-30" with the Julian calendar selected) or Hebrew ("15 Nisan 5786" or "5786-7-15" with religious month numbering, 1 = Nisan). The engine implements the classical fixed calendar: the mean molad (29d 12h 793 halakim) from the BaHaRaD epoch, the four dehiyyot (Molad Zaken, Lo ADU Rosh, GaTaRaD, BeTU-TaKPaT), the 19-year Metonic cycle with leap years 3/6/8/11/14/17/19, and the 14 keviyot year types that drive the 54-portion Torah reading cycle — including the canonical combined portions and the Israel/Diaspora difference (an extra festival Shabbat in the Diaspora). Outputs: bilingual Hebrew/English date with gematriya year, molad time, which postponement rules fired, keviyah in Hebrew letters, this and next week’s parasha, the Omer day when in season, and every major festival of that Hebrew year with Gregorian dates (each Jewish day starts the evening before). Candle-lighting times require a location and are out of scope.

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Hebrew / Jewish Calendar Bilingual Date Converter

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Key facts

Overview

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How it works

Use cases

Examples

1. Converting a Gregorian Shabbat during the Omer Season

2. Verifying Rosh Hashanah Postponement from Hebrew Date Input

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