Hebrew calendar converter
Choose a Gregorian date to see its Hebrew date, or enter a Hebrew year, month and day to find the Gregorian date. The tool handles the leap-year months Adar I and Adar II and tells you whether the Hebrew year is a leap year.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose the direction: Gregorian to Hebrew or Hebrew to Gregorian.
- Pick a date, or enter the Hebrew year, month and day.
- Read the converted date. For a Hebrew date, the tool also says whether the Hebrew year is a leap year.
How it works
The tool asks your browser’s built-in Hebrew calendar for the Hebrew date of a Gregorian day. To go the other way it checks the days of the Gregorian window in which that Hebrew year falls (about 13 months from late August or early September) until it finds a match. A Hebrew year is a leap year when (7 × year + 1) mod 19 is less than 7.
The Hebrew year starts on 1 Tishri in September or October. Year 5787 began on 12 September 2026.
Worked examples
- 12 September 2026 is 1 Tishri 5787, Rosh Hashanah.
- 21 March 2025 is 21 Adar 5785, a non-leap year, so there is a single Adar.
- 1 March 2024 is 21 Adar I 5784, because 5784 was a leap year.
Good to know
Because a Hebrew day starts at sunset, dates for events in the evening can differ from what you expect. Check the evening convention of your community for religious observances.
Frequently asked questions
Why does a Hebrew day start the evening before?
In the Hebrew calendar a day runs from sunset to sunset. This tool gives the Gregorian calendar day on which the Hebrew day is daytime, so the evening before is still the previous Hebrew date. A holiday such as Rosh Hashanah begins at sundown on the evening before the date shown.
When is Rosh Hashanah in 2026?
The Hebrew year 5787 begins on 1 Tishri, which is 12 September 2026. The holiday starts at sundown on 11 September. Enter Hebrew year 5787, month Tishri, day 1 to check.
What are Adar I and Adar II?
The Hebrew calendar is lunisolar and adds a 13th month in 7 of every 19 years. In those leap years Adar is doubled into Adar I and Adar II. In other years there is a single Adar. Choose Adar for Adar II in a leap year.
Which years can I convert?
Gregorian years 1900 to 2100, which are Hebrew years 5661 to 5861. The Hebrew year number is counted from a traditional date of creation and changes at Rosh Hashanah, not on 1 January.