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Hebrew Calendar Converter

Converts a Gregorian date to the Hebrew calendar, with Rosh Hashanah, the year length and whether Adar I is inserted.

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In short The Hebrew calendar is lunisolar: months follow the moon and an extra month is inserted seven times in every nineteen years so the festivals stay in their seasons. That leaves a year that can be one of exactly six lengths — 353, 354, 355, 383, 384 or 385 days — and which one it is depends on postponement rules designed to stop certain festivals falling on certain weekdays. Those rules are why Heshvan and Kislev change length from year to year while every other month is fixed, and why the calendar cannot be reduced to a simple cycle. In a leap year the extra month is Adar I and the original becomes Adar II, which matters for anniversaries: a date in Adar of an ordinary year corresponds to Adar II in a leap year. One more thing this page cannot show you: the Hebrew day begins at sunset, not midnight, so an evening event already belongs to the next Hebrew date.

How to use the Hebrew Calendar Converter

  1. Pick the Gregorian date.
  2. Read the Hebrew date, the Rosh Hashanah that began that year and the year length.
  3. Remember the Hebrew day starts at sunset — an evening date is already the next day.

About the Hebrew Calendar Converter

The Hebrew Calendar Converter converts a Gregorian date to the Hebrew calendar, with Rosh Hashanah, the year length and whether Adar I is inserted. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Finding the Hebrew date for a birthday or a yahrzeit.
  • Converting a date on a document or a certificate.
  • Understanding why a Hebrew anniversary moves against the Gregorian one.

Details

TypeLunisolar — months follow the moon, a leap month keeps the seasons
Leap yearsSeven in every nineteen, adding Adar I
Year lengthsExactly six are possible: 353, 354, 355, 383, 384, 385
Variable monthsOnly Heshvan and Kislev change length
VerifiedRound trip exact, and only the six legal year lengths ever appear
The year length shown is worth reading. It is the single figure that tells you whether Heshvan and Kislev were lengthened or shortened that year, which is what makes two Hebrew years of the same type differ.

Where this tool stops

Converts calendar dates. The Hebrew day begins at sunset and this page cannot know the hour you mean.

Explained in our guides

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Frequently asked questions

Why does the Hebrew date change at sunset?
Because the Hebrew day is counted from evening to evening. This page converts calendar dates, so a date entered here is the daytime one; anything after sunset already belongs to the following Hebrew date. For a yahrzeit or a festival that distinction matters.
What is Adar I?
The extra month inserted in a leap year, seven times in every nineteen. In those years the original Adar becomes Adar II, which is where festivals such as Purim fall. A date in Adar of an ordinary year maps to Adar II, not Adar I.
Why can a Hebrew year only be one of six lengths?
Because after the lunar months are counted, postponement rules adjust the start of the year so that certain festivals do not fall on certain weekdays. The adjustments can only add or remove a day from Heshvan or Kislev, so the possible totals collapse to six.
Is this the same calendar used for Israeli civil dates?
Israel uses the Gregorian calendar for most civil purposes and the Hebrew calendar for religious dates, official documents and the date on the news. Both appear side by side, which is exactly why a converter is useful.
Are there any usage caps on the Hebrew Calendar Converter?
There is no cost and no cap. The Hebrew Calendar Converter is not a demo of a paid product, so nothing is held back or watermarked.
Is my data uploaded anywhere?
No. The Hebrew Calendar Converter runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What problem does the Hebrew Calendar Converter solve?
Typical uses: finding the Hebrew date for a birthday or a yahrzeit. Converting a date on a document or a certificate. Understanding why a Hebrew anniversary moves against the Gregorian one. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Hebrew Calendar Converter stop being reliable?
Converts calendar dates. The Hebrew day begins at sunset and this page cannot know the hour you mean. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Hebrew Calendar Converter?
Type is Lunisolar — months follow the moon, a leap month keeps the seasons. Leap years is Seven in every nineteen, adding Adar I. Year lengths is Exactly six are possible: 353, 354, 355, 383, 384, 385. These are printed on the page itself, so you do not have to take them on trust.
Is there an app version?
Yes. The page is responsive and the utility works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.

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