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Hebrew calendar converter

Convert any date between the Gregorian and Hebrew (Jewish) calendars, both ways and live as you type. It shows the Hebrew day, month name (Tishrei, Cheshvan, Av…) and year counted from Creation (Anno Mundi), correctly handling leap years where Adar splits into Adar I and Adar II. Powered by the exact Dershowitz–Reingold arithmetic algorithm.

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Hebrew calendar converter is free to use as often as you like, directly from this page. Its place is under Dates & time; Hijri calendar converter and Chinese lunar calendar converter answer the questions closest to this one.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Hebrew calendar converter do?

Convert any date between the Gregorian and Hebrew (Jewish) calendars, both ways and live as you type. It shows the Hebrew day, month name (Tishrei, Cheshvan, Av…) and year counted from Creation (Anno Mundi), correctly handling leap years where Adar splits into Adar I and Adar II. Powered by the exact Dershowitz–Reingold arithmetic algorithm.

When would I actually use this?

Answering a scheduling question exactly: how many working days until a deadline, what date falls sixty days out, and what time that is for a colleague elsewhere.

What is the most common mistake?

Counting days by subtracting dates and forgetting whether the endpoints are included. Inclusive and exclusive counts differ by one, which is the difference between meeting a deadline and missing it.

How is Hebrew calendar converter different from Hijri calendar converter?

They sit next to each other but answer different questions: Hijri calendar converter is the one to open when you need it to convert dates between the Gregorian and Islamic (Hijri) calendars in both directions, updating live as you type. It shows the Hijri day, month name (Muharram, Safar, Ramadan…) and the year counted from the Hijra (AH), using the tabular civil algorithm with the standard astronomical epoch. Note that arithmetic dates may differ by a day from the local moon-sighting calendar. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Chinese lunar calendar converter is the closest one after this: Convert dates between the Gregorian solar calendar and the traditional Chinese lunisolar calendar (1900–2100), both ways and live. It shows the lunar month and day names, the sexagenary stem-branch (干支) year and its zodiac animal, and correctly handles leap months (闰月). Find out which lunar date a birthday falls on, or when Chinese New Year lands.

What else is worth having open alongside it?

Public holidays calendar and School holidays calendar — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Calendar arithmetic follows the proleptic Gregorian calendar and the IANA time-zone database, so daylight-saving transitions and leap years are handled. Public holidays vary by country and region and are not assumed.

Further reading

All guides →
ExplainerDate Arithmetic Is Harder Than It Looks"One month later" has no single correct answer, and every date library has had to pick one. Month addition is neither associative nor invertible, a day is not always 24 hours, and age is not days divided by 365.25.ExplainerLeap Years: The Rule, the Exception, and the Exception to the ExceptionDivisible by four, except centuries, except centuries divisible by four hundred. The three-line rule exists because the tropical year is not 365.25 days, and the arithmetic behind it explains ten deleted days in 1582 and a calendar that repeats exactly every 400 years.ExplainerHow Moon Phases Work: Two Months, Eight Shapes, and No ShadowThe phase cycle takes 29.53 days but the orbit takes only 27.32, and the 2.21-day gap is the entire explanation. With the eight phases, their illumination, when each rises and sets, and how they flip south of the equator.GuideChinese Zodiac: The 12 Animals, Their Years and the New Year TrapThe twelve-year animal cycle, the years each animal covers, and why anyone born in January or early February is usually assigned the wrong one.ExplainerReading and Writing Military Time0800 is not “eight o'clock” and not “08:00” — it is “zero eight hundred”, with a zone letter on the end. The four digits, the spoken form, midnight at 0000, the argument about 2400, and the reason 12-hour notation cannot settle noon.ExplainerWorking Out an AnniversaryCounting back and counting forward are two different sums, and they disagree by a year on the day itself. What this calculator does with 29 February, what other date libraries do, and where the traditional and modern gift lists actually come from.