MyCalcBuddy

Hebrew Calendar Calculator

Convert between Gregorian and Hebrew calendar dates. View Hebrew months and major Jewish holidays.

Hebrew Months

1. Nisan
2. Iyar
3. Sivan
4. Tammuz
5. Av
6. Elul
7. Tishrei
8. Cheshvan
9. Kislev
10. Tevet
11. Shevat
12. Adar

July 18, 2026

15 Tevet 5786

Regular Year (12 months)

Year 5786 Details

Hebrew Year: 5786

Month: Tevet

Day: 15

Leap Year: No

Major Jewish Holidays

Rosh HashanahJewish New Year
Yom KippurDay of Atonement
SukkotFeast of Tabernacles
HanukkahFestival of Lights
PurimFeast of Lots
PassoverPesach
ShavuotFeast of Weeks

What Is the Hebrew Calendar?

The Hebrew calendar (also called the Jewish calendar or Luach Ivri) is the official calendar of the Jewish people, used for determining the dates of Jewish holidays, Torah readings, and religious observances. It is a lunisolar calendar — meaning it tracks both the lunar cycle (months) and the solar year (seasons) simultaneously, adding intercalary months to keep the calendar aligned with the seasons.

The Hebrew calendar counts years from the traditional date of the creation of the world (Anno Mundi), making the Hebrew year 5784 correspond approximately to 2023–2024 CE. The year numbering is calculated as the Gregorian year plus approximately 3,760 (the offset varies slightly depending on the time of year).

The Hebrew calendar has 12 months in regular years and 13 months in leap years. Unlike the Gregorian calendar, months are lunar — each month begins with the new moon, and is either 29 or 30 days long. A Hebrew leap year (called a shanah me'uberet or "pregnant year") adds a second Adar month (Adar II) to synchronize the calendar with the solar year, keeping holidays in their correct seasons. Leap years occur 7 times in every 19-year Metonic cycle: in years 3, 6, 8, 11, 14, 17, and 19 of the cycle.

Gregorian to Hebrew Conversion

The Hebrew calendar conversion uses Julian Day Numbers as an intermediate step, then applies the Hebrew calendar's arithmetic rules based on the number of days elapsed since the Hebrew epoch.

Hebrew Year Approximation

hebrewYear ≈ floor((daysSinceHebrewEpoch × 98496) / 35975351) + 1

Where:

  • hebrewEpoch= Julian Day 347995.5 — corresponding to the traditional creation date (Tishrei 1, year 1 AM)
  • daysSinceHebrewEpoch= JD − 347995.5 (continuous day count from the Hebrew epoch)
  • 98496 / 35975351= Ratio approximating 1/mean Hebrew year length (≈ 365.24682 days)
  • isHebrewLeapYear= (7 × hebrewYear + 1) mod 19 < 7 — true if the year falls in the 7 leap positions of the 19-year cycle

The Hebrew Months

The Hebrew calendar has 12 regular months (13 in leap years), with months alternating between 29 and 30 days (with some variation for calendar adjustment). The year begins with Tishrei in the fall:

# Hebrew Month Gregorian Equivalent Key Holiday
1 (civil)TishreiSep–OctRosh Hashanah, Yom Kippur, Sukkot
2CheshvanOct–Nov—
3KislevNov–DecHanukkah (begins 25 Kislev)
4TevetDec–Jan—
7 (religious)NisanMar–AprPassover (Pesach)
9SivanMay–JunShavuot

Note: The civil new year (Rosh Hashanah) begins in Tishrei, but the religious new year counts from Nisan (the month of the Exodus). This dual-counting system is explicitly mentioned in the Torah.

Major Jewish Holidays

All Jewish holidays follow the Hebrew calendar and shift relative to the Gregorian calendar each year. Key observances include:

  • Rosh Hashanah (Jewish New Year): 1–2 Tishrei — the civil new year and ten-day period of repentance leading to Yom Kippur.
  • Yom Kippur (Day of Atonement): 10 Tishrei — the holiest day in the Jewish calendar, observed with fasting and prayer.
  • Sukkot (Feast of Tabernacles): 15–21 Tishrei — a harvest festival commemorating the wilderness period.
  • Hanukkah (Festival of Lights): 25 Kislev – 3 Tevet — eight-day celebration of the rededication of the Temple in Jerusalem.
  • Passover (Pesach): 15–22 Nisan — commemorates the Exodus from Egypt; includes the Passover Seder.
  • Shavuot (Feast of Weeks): 6 Sivan — commemorates receiving the Torah at Mount Sinai.

How to Use This Calculator

  1. Select a Gregorian Date: Use the date picker to choose any date you want to convert.
  2. View the Hebrew Date: The result shows the equivalent Hebrew date in the format Day Month Year (e.g., 15 Nisan 5784).
  3. Check Month Highlight: The month list on the left highlights the current Hebrew month.
  4. Note Leap Year: The year type panel indicates whether the Hebrew year is a regular (12-month) or leap (13-month) year.
  5. View Holidays: The holidays panel lists major Jewish observances for easy reference.

Worked Examples

Convert January 1, 2024 to Hebrew Calendar

Problem:

What is January 1, 2024 in the Hebrew calendar?

Solution Steps:

  1. 1Compute Julian Day for January 1, 2024: JD ≈ 2460310.5
  2. 2daysSinceHebrewEpoch = 2460310.5 − 347995.5 = 2,112,315 days
  3. 3hebrewYear ≈ floor(2,112,315 × 98496 / 35975351) + 1 = 5784
  4. 4January 1 falls in the month of Tevet (the 4th Hebrew month counting from Tishrei)
  5. 5Approximate day in Tevet: around 20 Tevet 5784

Result:

January 1, 2024 ≈ 20 Tevet 5784 in the Hebrew calendar.

Rosh Hashanah 5785

Problem:

When does Rosh Hashanah 5785 fall in Gregorian?

Solution Steps:

  1. 1Rosh Hashanah is always 1 Tishrei of the Hebrew year
  2. 25785 begins after the end of 5784
  3. 3Rosh Hashanah 5785 = October 2–4, 2024 (Gregorian)
  4. 4The two-day observance spans 1–2 Tishrei

Result:

Rosh Hashanah 5785 begins at sundown on Wednesday, October 2, 2024 Gregorian.

Hebrew Leap Year Check

Problem:

Is Hebrew year 5784 a leap year?

Solution Steps:

  1. 1Leap year rule: (7 × year + 1) mod 19 < 7
  2. 2(7 × 5784 + 1) mod 19 = 40489 mod 19
  3. 340489 / 19 = 2131 remainder 0; 40489 mod 19 = 0
  4. 40 < 7? Yes — Hebrew year 5784 IS a leap year (has 13 months, including Adar I and Adar II)

Result:

Hebrew year 5784 (2023–2024) is a leap year with 13 months.

Tips & Best Practices

  • ✓Hebrew dates begin at sunset — a holiday on 15 Nisan starts at sundown the previous Gregorian evening.
  • ✓Add approximately 3760 to the Gregorian year to get the approximate Hebrew year (add 3761 between Rosh Hashanah and December 31).
  • ✓Check whether the Hebrew year is a leap year before planning events near Adar — a 13th month (Adar I) shifts all subsequent holiday dates by about a month.
  • ✓Hanukkah starts on 25 Kislev — if Kislev has 29 days in a given year, Hanukkah will end in Tevet rather than Kislev.
  • ✓Rosh Hashanah can never fall on Sunday, Wednesday, or Friday — the Hebrew calendar includes postponement rules (dechiyot) to prevent this.
  • ✓For definitive Hebrew dates for legal, religious, or genealogical purposes, cross-reference with a dedicated Hebrew calendar source or Jewish community calendar.

Related Calculators

Islamic Calendar Calculator

Convert Gregorian dates to the Islamic Hijri calendar

Ethiopian Calendar Calculator

Convert dates to the Ethiopian (Ge'ez) calendar

Easter Date Calculator

Calculate Easter Sunday for Western and Orthodox traditions

Lunar Calendar Calculator

Convert dates using lunar calendar systems

Frequently Asked Questions

The Hebrew calendar has two 'new year' concepts. Rosh Hashanah (1 Tishrei, in the fall) is the civil new year — the anniversary of creation — and marks the beginning of the year numbering. However, Nisan (the spring month of Passover) is the 'first month of the year' in the religious sense, as described in the Torah in the context of the Exodus. Jewish tradition preserves both counts simultaneously.
Like the Gregorian calendar, the Hebrew calendar uses leap years to compensate for the difference between 12 lunar months (354 days) and the solar year (365.25 days). Seven leap years are added every 19 years (the Metonic cycle). In a leap year, an entire extra month (Adar I) is inserted before Adar (renamed Adar II), adding 29–30 days to keep Passover in the spring. This system was formalized by Hillel II in the 4th century CE.
In Jewish tradition, each day begins at nightfall (sunset) and ends at the following nightfall. This is derived from the Genesis narrative ('and there was evening and there was morning'). Practically, this means a Hebrew date changes at sundown — so a holiday beginning on a Hebrew date actually starts the evening before in Gregorian terms. For example, Rosh Hashanah 1 Tishrei begins at sunset the previous Gregorian day.
This calculator uses a simplified Julian Day-based approximation that provides the correct Hebrew year and approximate month and day for most modern dates. For exact Hebrew dates — particularly near month boundaries where the exact length of each month matters — a full implementation of the Hebrew calendar's molad (lunar mean) calculations and the four dechiyot (postponement rules) would be required. For critical religious determinations (Jewish law requires exact dates for holidays and life-cycle events), consult a rabbi or a certified Hebrew calendar resource.
The Hebrew calendar year count (Anno Mundi) starts from the traditional date of creation. The approximate conversion is: Hebrew year ≈ Gregorian year + 3760 (add 3761 from Rosh Hashanah to December 31). So 2024 CE corresponds to Hebrew years 5784–5785. The Hebrew year 5785 began at Rosh Hashanah on October 2–4, 2024.

Sources & References

Last updated: 2026-06-06

💡

Help us improve!

How would you rate the Hebrew Calendar Calculator?

<>

Editorial Note

MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

Source

Formula Source: Standard Mathematical References

by Various

UpdatedLast reviewed: May 2026
CheckedFormula checks are based on standard references and internal QA review.

Privacy choices

MyCalcBuddy uses necessary storage for the site to work. Optional analytics, notifications, and future advertising features stay off unless you allow them.