Hebrew Calendar Calculator
Hebrew Calendar Converter works out Hebrew date and Hebrew year from Convert, Gregorian date and Hebrew year. The default figures on this page give hebrew date of 23 Tevet 5760; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- Hebrew year 5760 begins on 1999-09-11 and runs 385 days - a complete leap year of 13 months.
- (7 x 5760 + 1) mod 19 = 3, which is less than 7, so this is a leap year with Adar I.
- Tevet has 29 days in 5760; the date is 23 Tevet 5760, which is 2000-01-01.
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the Hebrew Calendar Converter calculates
Converts a Gregorian date to the Hebrew date and back, using the arithmetic (molad-based) Hebrew calendar with its postponement rules: seven leap years in each 19-year cycle add the month of Adar I, and Cheshvan and Kislev flex by a day so a common year runs 353-355 days and a leap year 383-385. A Hebrew day runs sunset to sunset, so the date given is the one covering the daytime of the Gregorian date.
How to use this Hebrew Calendar Converter
Enter Convert, Gregorian date, Hebrew year and Hebrew month. Hebrew date updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Hebrew date, Hebrew year and Hebrew month.
The method follows Nachum Dershowitz and Edward M. Reingold, Calendrical Calculations, 4th edition, chapter 8 (The Hebrew Calendar) and Encyclopaedia Britannica, "Jewish calendar" (structure, month names and year types).
The first day of 2000 example
With Convert: gregorian-to-hebrew, Gregorian date: 2000-01-01, the calculator returns Hebrew date: 23 Tevet 5760, Hebrew year: 5760, Hebrew day of the month: 23. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Hebrew date, Hebrew year and Hebrew month. The inputs you can vary are Convert, Gregorian date, Hebrew year, Hebrew month and Hebrew day of the month.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
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Frequently asked questions
What information do I need for the Hebrew Calendar Converter?
You need Convert, Gregorian date, Hebrew year, Hebrew month and Hebrew day of the month. The page opens with default figures that give hebrew date of 23 Tevet 5760, so you can see the scale before entering your own.
What does this Hebrew Calendar Converter show?
It shows Hebrew date, Hebrew year, Hebrew month, Hebrew month number (Nisan = 1), Hebrew day of the month, Gregorian date, Weekday and Hebrew leap year, with the working and any warnings for your entries.
Can I check how the Hebrew Calendar Converter result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.