Most people meet the Hebrew calendar at a family moment: a grandparent’s yahrzeit, a child’s bar or bat mitzvah, a date carved into a headstone, or a holiday that insists on landing on a different Gregorian date every year. The Hebrew calendar converter above translates any date between the Gregorian calendar you use every day and the Hebrew (Jewish) calendar, in both directions, including the leap years when a thirteenth month appears.
The Hebrew calendar is lunisolar. Its months follow the moon, but its years keep step with the sun by adding a whole extra month in seven years out of every nineteen. That design is why Passover stays in spring and why your Hebrew birthday rarely matches your Gregorian one. Enter a date below to see both sides of it at once.
Gregorian to Hebrew
Hebrew to Gregorian
How to Use the Converter
For the common direction, pick any Gregorian date and press Convert to Hebrew. The result shows the Hebrew day, month, and year, the day of the week, and whether that Hebrew year is a regular year of twelve months or a leap year of thirteen. For the reverse direction, enter the Hebrew day, choose the month, type the year, and the matching Gregorian date appears.
Two details make the reverse direction easier. First, the month list offers Adar, Adar I, and Adar II separately, because leap years split Adar in two. If you pick Adar I or Adar II for a year that is not a leap year, the converter explains that instead of guessing. Second, in a leap year a plain Adar date is read as Adar II, which matches how most anniversaries and Purim itself are observed. If you type a day that a month does not have in that particular year, the tool says so rather than silently rolling into the next month.
The Hebrew Calendar in Brief
The Hebrew calendar counts years from the traditional date of creation, a system called Anno Mundi. That is why its year numbers run about 3,760 higher than Gregorian ones: most of the Gregorian year maps to Hebrew year plus 3760, and from Rosh Hashanah in the autumn through December the offset is 3761. The year 5786, for example, began in September 2025.
Each month begins at the new moon, so months alternate between 29 and 30 days and a twelve-month year totals only about 354 days. Left alone, the holidays would slide eleven days earlier each year and Passover would soon fall in midwinter. The fix is the leap month: in seven years of each nineteen-year cycle, an extra month is inserted so the calendar catches up with the seasons. A Hebrew day also differs from a civil day in one important way: it begins at sundown, a point the converter handles by the usual daytime convention, discussed below.
The Months of the Hebrew Year
The civil year opens with Tishri, the month of Rosh Hashanah, even though the religious cycle counts from Nisan in spring. Heshvan and Kislev are the flexible months: each can gain or lose a day so that the year lands on one of its permitted lengths.
| Month | Days | Usual Gregorian season |
|---|---|---|
| Tishri | 30 | September to October |
| Heshvan | 29 or 30 | October to November |
| Kislev | 30 or 29 | November to December |
| Tevet | 29 | December to January |
| Shevat | 30 | January to February |
| Adar | 29 | February to March (regular years) |
| Adar I | 30 | February to March (leap years only) |
| Adar II | 29 | March to April (leap years only) |
| Nisan | 30 | March to April |
| Iyar | 29 | April to May |
| Sivan | 30 | May to June |
| Tammuz | 29 | June to July |
| Av | 30 | July to August |
| Elul | 29 | August to September |
Leap Years and the Two Adars
The nineteen-year pattern is called the Metonic cycle. Within each cycle, years 3, 6, 8, 11, 14, 17, and 19 are leap years. Recent examples are 5784 and 5787, while 5785 and 5786 are regular years. In a leap year the extra month is a second Adar: the original becomes Adar I with 30 days, and Adar II follows with 29. Festivals that belong to Adar, above all Purim, are celebrated in Adar II, which is why a plain Adar date in a leap year is normally read as Adar II.
The extra month changes the length of the year as well. A regular year lasts 353, 354, or 355 days depending on whether Heshvan and Kislev are short or long, and a leap year lasts 383, 384, or 385 days. This is also why the gap between a Hebrew birthday and its Gregorian date moves around: the same Hebrew date can arrive up to a month apart in neighboring Gregorian years.
Worked Examples
Example 1: Rosh Hashanah 5786
Enter 23 September 2025 in the Gregorian field and the converter returns 1 Tishri 5786, the first day of Rosh Hashanah, the Jewish New Year. Ten days later, 2 October 2025 is 10 Tishri, which is Yom Kippur.
Example 2: Passover 5785
Enter 13 April 2025 and the result is 15 Nisan 5785, the first day of Passover. Nisan is the month the religious cycle counts as the first month, even though the year number changes back in Tishri.
Example 3: The reverse direction
Now run it backwards: enter day 15, month Nisan, year 5786 in the Hebrew fields. The converter searches forward and returns Thursday, 2 April 2026. The same festival fell on 13 April the year before, a shift of nearly two weeks caused by the leap month pattern.
Why People Convert Between the Calendars
The most personal use is birthdays. A Hebrew birthday falls on the same Hebrew date each year, so it drifts against the Gregorian calendar, and milestones are counted in Hebrew years: a boy's bar mitzvah is at thirteen Hebrew years, a girl's bat mitzvah at twelve. Families who celebrate both birthdays need a converter to find this year's Gregorian date for a Hebrew birthday, and the reverse to record a newborn's Hebrew date in the first place.
Yahrzeit, the anniversary of a death, is observed on the Hebrew date, so the Gregorian date changes every year and must be recalculated for candle-lighting and memorial notices. Genealogists use the converter for the opposite journey through time, reading Hebrew dates on headstones, marriage contracts, and old letters and pinning them to civil dates. Holiday planning is the everyday case: every festival has a fixed Hebrew date and a moving Gregorian one. If your date work involves computers instead of calendars, our Discord Timestamp Converter turns Unix timestamps into date stamps that render correctly inside Discord posts.
The Sundown Rule
One convention deserves care. A Hebrew day runs from sundown to sundown, not midnight to midnight, so the Hebrew date for an evening event is the one that begins that evening. Converters, including this one, report the Hebrew date that covers the daytime of the Gregorian date you enter. If a birth, wedding, or death happened after dark, the correct Hebrew date is the following day, and you should convert the next Gregorian date instead. The same rule explains why holidays and Shabbat begin the evening before the date printed in most calendars.
Frequently Asked Questions
How do I find today's Hebrew date?
The converter opens with today's Gregorian date already converted, so the current Hebrew date is the first result on the page. As a rough check, the Hebrew year is the Gregorian year plus 3760 for most of the year, and plus 3761 from Rosh Hashanah in the autumn through the end of December.
Why do I add 3760 or 3761 to get the Hebrew year?
Hebrew years are counted from the traditional date of creation, which sits 3760 years before the Gregorian count at the point where the years overlap. Because the Hebrew year starts in autumn rather than January, dates from Rosh Hashanah to December use an offset of 3761, while dates from January until Rosh Hashanah use 3760.
What is the difference between Adar, Adar I, and Adar II?
In a regular year there is a single month of Adar with 29 days. In a leap year, an extra month is added: the first is called Adar I and has 30 days, and the second is Adar II with 29 days. Festivals of Adar, such as Purim, are kept in Adar II, so a plain Adar date in a leap year is read as Adar II.
When is my Hebrew birthday this year?
Convert your Gregorian birth date with this tool to learn your Hebrew birth date, then enter that Hebrew day, month, and the current Hebrew year in the reverse direction. The result is the Gregorian date of your Hebrew birthday this year. If you were born after sundown, use the following Hebrew day.
How long is a Hebrew year?
A regular Hebrew year has 353, 354, or 355 days, depending on whether the flexible months of Heshvan and Kislev are short or long that year. A leap year, which adds the month of Adar I, has 383, 384, or 385 days.
Is the Hebrew calendar the same as the Jewish calendar?
Yes, the two names describe the same calendar. Hebrew calendar is the more common term in reference works, while Jewish calendar is often used in everyday speech and by community calendars. Both use the same months, leap-year cycle, and Anno Mundi year count, so dates from this converter match either name.