Hebrew Date Converter
Convert Gregorian and Hebrew dates in either direction, including leap-year Adar months and the original date's sunset boundary.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
|---|
How to use this calculator
Choose a direction. For a Gregorian input, indicate whether the event was before or after local sunset. Reverse conversion uses a named Hebrew month.
The Hebrew date's daylight portion is returned with its preceding sunset date. Sunset clock times are not inferred. Calendar conversion uses browser Intl/ICU and rejects nonexistent dates.
A worked example
November 4, 2026 before sunset is 24 Cheshvan 5787; after sunset it is 25 Cheshvan.
Does the date begin at midnight?
No. The Hebrew date begins the preceding evening at local sunset. Supply the correct before/after boundary; this converter does not determine that clock time.
Further reading: ICU calendar methods. Your entered rules determine this result.
Which calendar and years are supported?
Gregorian input coverage is 1900-2100 unless the method states a narrower range. Results explain calendar conventions and local date boundaries. Astronomy uses a level horizon at sea level. CSV, print and copy retain the result rules; calendar files contain only calculated events. Nothing is scheduled automatically.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.