Hebrew Date Converter
Pick any Gregorian date to see its Hebrew calendar equivalent, plus the exact date of Passover, Rosh Hashanah, Yom Kippur, Hanukkah, Purim, and Shavuot for that year — calculated, not estimated.
Hebrew date
How the conversion works
The Hebrew calendar is lunisolar: its months follow the moon (about 29.5 days each), while a 19-year cycle adds a 13th "leap" month (a second Adar) seven times per cycle to keep the calendar in step with the solar year and the harvest seasons the Torah ties its festivals to (Leviticus 23). This calculator uses the traditional fixed-arithmetic calendar — the same molad (new moon) calculation and postponement rules (dechiyot) used to set the modern Hebrew calendar since Hillel II standardized it in the 4th century — rather than an approximation, so the dates it returns match the calendar used by synagogues and Jewish organizations today.
Because Hebrew days begin at sunset, the date shown is the Hebrew calendar day whose daytime hours overlap with the Gregorian date you picked. Its evening (the start of the next Hebrew day) comes after sunset that same Gregorian evening — this matters most for holidays that begin at sundown, like the first Passover Seder (the evening that opens 15 Nisan) or Rosh Hashanah.
Frequently asked questions
Why does Passover fall on a different Gregorian date every year?
Passover is fixed on the Hebrew calendar — 15 Nisan, in the spring — but the Hebrew calendar is lunisolar, not solar, so 15 Nisan lands on a different Gregorian date each year (though always in March or April, since the leap-month rule keeps Nisan anchored to spring).
Is this the same calculation used by Jewish organizations and synagogues?
Yes — this calculator uses the same fixed molad-and-postponement-rule arithmetic that has set the standardized Hebrew calendar since the 4th century, not an approximation. It should match the dates published by Chabad, Hebcal, and similar sources.
How is this different from the Easter date on the Holiday Countdown Calculator?
Different calendars entirely. Easter (on the Holiday Countdown Calculator) is calculated from the Gregorian solar calendar using the Western church's Easter algorithm. Passover, Rosh Hashanah, and the other holidays here follow the Hebrew lunisolar calendar. The two were historically connected — early Easter dating was tied to Passover — which is part of why both move around the same season.
Why does Purim sometimes fall in "Adar I" and sometimes just "Adar"?
In a regular (non-leap) Hebrew year there's only one Adar, and Purim falls on its 14th day. In a leap year, a second Adar month (Adar II) is added, and Purim moves to the 14th of Adar II — this calculator resolves that automatically for the year you pick.
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