Hebrew calendar
Your date of birth in the Hebrew calendar
The Hebrew calendar keeps neither the same months nor the same year as the Gregorian one. Enter a date, and here is what it answers to.
How the correspondence is worked out
The Hebrew year runs to twelve lunar months, eleven days short of a solar year. So that the festivals do not drift through the seasons, a thirteenth month is added seven years in every nineteen. It is that gap, rather than any fixed conversion, that keeps a Hebrew date from landing on the same Gregorian day twice.
The calculation here is done by the @hebcal library, the same one the app uses. It is entirely local: nothing is sent anywhere, and the date you enter is not kept.
The Hebrew day begins at sunset
A birth after sunset already belongs to the next Hebrew day. Settling that needs the time and the place of birth, which this page does not ask for: what is shown here is the daytime correspondence, before the rule is applied.
Common questions
- Why does my Hebrew birthday fall on a different date every year?
- It does not move: the Gregorian date opposite it does. Your Hebrew birthday falls on the same day of the same Hebrew month every year, but the gap between the two calendars puts that day against a different Gregorian date each time.
- What if I was born on the 30th of a month that only has 29 days?
- Some Hebrew months change length from year to year. Where the day of birth does not exist in a given year, the birthday falls back to the last day of the month. The best-known case is a birth in Adar: in a leap year it moves to the second Adar.
- What is the tribe shown here?
- The tradition attaches a tribe of Israel to each Hebrew month, following the order of the encampment around the Tabernacle from Nisan. Twelve months, twelve tribes — and Levi for the thirteenth month of a leap year.
- Does this page store my date of birth?
- No. The calculation happens as the page is drawn and nothing is written anywhere. The date appears in the page address, which is what lets you share or bookmark the result, and that is all.
Stop working it out again
In Never Forget, a saved birth date keeps its Hebrew correspondence — its day, its month, its tribe — and the reminder arrives on the morning of the day itself.
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