Hebrew Date Converter
Convert between Gregorian and Hebrew dates. See the weekly Torah portion, day of the week, and any Jewish holiday that falls on the date.
Calendar Boundaries and Pitfalls
Three boundary rules cause most conversion mistakes:
- The day changes at sunset, not midnight. An event at 22:00 on Tuesday already belongs to Wednesday on the Hebrew calendar. When converting an evening birth, wedding, or death date, always note whether it happened before or after nightfall (tzait haKochavim).
- Leap years add Adar I before Adar II. In a leap year the month numbered 12 is Adar I (30 days) and month 13 is Adar II (29 days). Converting "March of a leap year" to the wrong Adar shifts Purim and Fast of Esther by a month — this converter maps month 12 to Adar (I) and month 13 to Adar II exactly as the rabbinic calendar does.
- Cheshvan and Kislev can be 29 or 30 days. If a conversion lands on day 30 of Cheshvan or Kislev, the date is only valid in "full" or "complete" years; in a deficient year the equivalent date falls on the 29th. Yahrzeit and Hebrew-birthday calculators apply the "30th becomes 29th" rule automatically.
The 13 Hebrew Months at a Glance
| # | Month | Length | Key dates |
|---|---|---|---|
| 1 | Nissan | 30 days | Passover (15 Nissan) |
| 2 | Iyar | 29 days | Lag BaOmer (18 Iyar) |
| 3 | Sivan | 30 days | Shavuot (6 Sivan) |
| 4 | Tamuz | 29 days | Fast of 17 Tammuz |
| 5 | Av | 30 days | Tisha B'Av (9 Av), Tu B'Av (15 Av) |
| 6 | Elul | 29 days | Shofar month before Rosh Hashana |
| 7 | Tishrei | 30 days | Rosh Hashana (1), Yom Kippur (10), Sukkot (15–21) |
| 8 | Cheshvan | 29 or 30 days (variable) | No holidays — "Marcheshvan" |
| 9 | Kislev | 29 or 30 days (variable) | Chanukah from 25 Kislev |
| 10 | Tevet | 29 days | Fast of 10 Tevet |
| 11 | Sh'vat | 30 days | Tu B'Shvat (15 Sh'vat) |
| 12 | Adar (Adar I in leap years) | 29 days (30 for Adar I) | Purim (14 Adar / 14 Adar II) |
| 13 | Adar II (leap years only) | 29 days | Purim is kept in Adar II |
Rosh Hashana & Passover — Next 3 Years
| Hebrew Year | Rosh Hashana (1 Tishrei) | Passover (15 Nissan) |
|---|---|---|
| 5787 | September 12, 2026 | April 22, 2027 |
| 5788 | October 2, 2027 | April 11, 2028 |
| 5789 | September 21, 2028 | March 31, 2029 |
Every Jewish day begins on the evening before the date shown. Dates are computed algorithmically from the Hebrew calendar — the same engine that powers the converter above.
About the Hebrew Calendar
The Hebrew calendar is a lunisolar system: months follow the lunar cycle (29–30 days), while years are synchronized with the solar year through the addition of a leap month (Adar II) in years 3, 6, 8, 11, 14, 17, and 19 of a 19-year cycle. This ensures that Passover always falls in spring and Sukkot in autumn, as required by the Torah.
Days in the Jewish calendar begin at sunset, following the Genesis account "and there was evening, and there was morning." Therefore, Shabbat and holidays begin the evening before the date listed in secular calendars.
Frequently Asked Questions
Why does my Hebrew date change after sunset?
In the Hebrew calendar, every day begins at sunset — not at midnight — following the account of Creation, "and there was evening, and there was morning" (Genesis 1:5). If you were born or an event occurred after nightfall, the Hebrew date is that of the following civil day. A Friday evening event, for example, already belongs to Shabbat on the Hebrew calendar.
How are Adar I and Adar II handled in leap years?
In 7 of every 19 Hebrew years (years 3, 6, 8, 11, 14, 17, and 19 of the cycle), an extra month is added: Adar I (30 days) followed by Adar II (29 days). Purim is celebrated in Adar II. If you were born in Adar I, your birthday is observed in Adar II in non-leap years; if born in Adar II, it is observed in the single Adar. This converter handles both cases automatically.
Why do Cheshvan and Kislev sometimes have 30 days?
Unlike every other Hebrew month, Cheshvan and Kislev have a variable length of 29 or 30 days. The variation keeps the calendar aligned with the astronomical new moon (molad) and enforces rules such as Rosh Hashana never falling on Sunday, Wednesday, or Friday ("Lo ADU Rosh"). Hebrew years are therefore classified as deficient (353/383 days), regular (354/384), or complete (355/385).
What Hebrew year is it now?
The current Hebrew year is 5787 (5787). The Hebrew year number counts from the traditional date of Creation and begins on Rosh Hashana, which falls in September or October on the Gregorian calendar.
When does the Hebrew year begin?
The year number changes on 1 Tishrei (Rosh Hashana), but the Torah calls Nissan "the first of the months of the year" (Exodus 12:2) because it marks the Exodus from Egypt. This is why the Hebrew months are numbered from Nissan (1) to Adar (12/13), while the year rolls over in Tishrei, the seventh month.