How to use the gregorian to hebrew date converter
- Pick the Gregorian date to convert. The field starts on today and accepts any day from 1900 to 2100.
- Tick It is after sunset if you are converting an evening time. The Hebrew day begins at nightfall, so the evening already belongs to the next Hebrew date.
- Read the Hebrew day, month and year, the length of the month and whether the year is a leap year with 13 months.
- Use Copy result to keep the answer, or share the link to open the same date later.
Formula
Hebrew date = the Hebrew calendar date of the Gregorian day, as given by the calendar data built into your browser
Leap year when (7 x year + 1) mod 19 < 7
After sunset: convert the next Gregorian day instead
In a leap year an extra month, Adar II, is added, so the year has 13 months. Leap years are years 3, 6, 8, 11, 14, 17 and 19 of a 19-year cycle.
Worked examples
October 3, 2024 is 1 Tishri 5785 AM. Tishri has 30 days, and 5785 is not a leap year because (7 x 5785 + 1) = 40,496 leaves a remainder of 7 when divided by 19, which is not below 7. April 13, 2025 is 15 Nisan 5785, the first day of Passover.
March 24, 2024 is 14 Adar II 5784 AM. The year 5784 is a leap year because (7 x 5784 + 1) = 40,489 divides evenly by 19, a remainder of 0, so it has 13 months and Adar II has 29 days. For October 2, 2024 with It is after sunset ticked, the tool converts October 3 and returns 1 Tishri 5785.
How the Hebrew calendar works
The Hebrew calendar follows both the moon and the sun. Months start with the new moon and have 29 or 30 days, and a 19-year cycle adds a thirteenth month in seven of its years so that holidays stay in their seasons. The year number counts from a traditional date for the creation of the world, which is why it is labeled AM, for Anno Mundi, and why it is larger than the Gregorian year by 3,760 or 3,761, depending on whether the Hebrew new year in September or October has passed.
The year starts on 1 Tishri, in September or October, not in the spring, even though Nisan is counted as the first month for holidays. Months are named Tishri, Heshvan, Kislev, Tevet, Shevat, Adar, Nisan, Iyar, Sivan, Tamuz, Av and Elul, with Adar I and Adar II in leap years. Heshvan and Kislev can have 29 or 30 days depending on the year.
What this tool does not do
The conversion uses the calendar built into your browser, and the leap year line is computed separately from the 19-year rule so you can see the logic. In testing, the rule and the browser agreed on every year from 1950 to 2060. The tool does not list holidays, Torah readings, candle lighting times or the exact time of nightfall, which depends on where you are.
For other calendar and date work, see the Hijri date converter, the date calculator and the Julian date calculator.
Assumptions and limits
- Results come from your browser calendar data, for Gregorian dates from the year 1900 to 2100.
- The after-sunset option adds one day. It does not calculate when sunset or nightfall happens where you live.
- Month names are the ones your browser gives in English, such as Tishri, which some sources spell Tishrei.
- Holidays and religious observances are not calculated.
Frequently asked questions
What does AM mean after the Hebrew year?
AM stands for Anno Mundi, Latin for year of the world. The Hebrew year count starts from a traditional date for creation, so the year 5785 began in the fall of 2024 on the Gregorian calendar.
Why does a Hebrew day start in the evening?
In the Hebrew calendar each day runs from nightfall to nightfall. That is why an evening time belongs to the next Hebrew date, and why the tool has an after sunset option.
How can I tell if a Hebrew year is a leap year?
Multiply the year by 7, add 1, and divide by 19. If the remainder is less than 7, the year is a leap year with 13 months. The tool shows this calculation in its steps.
Does the converter show Jewish holidays?
No. It converts one date at a time and does not list holidays or times. You can convert the date of a holiday you know to check its Hebrew date, such as 1 Tishri for the start of the new year.