Hebrew date converter: Gregorian to Hebrew and back

Type a date in either calendar to get its match, including the sundown rule and Adar I or Adar II.

Computed from the Hebrew calendar in your browser · test dates verified against published Hebrew calendarsLast reviewed: October 9, 2026

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Day
Year

Pre-filled with September 12, 2026, which is Rosh Hashanah 5787. A Jewish day begins at sundown, so a date in the evening belongs to the next Hebrew day.

Hebrew date
1 Tishrei 5787
Gregorian date
September 12, 2026
Weekday (daytime)
Saturday
Hebrew day began
at sundown on Friday, September 11, 2026
Hebrew year
5787: Leap year, 13 months (Adar I and Adar II)
ISO format
2026-09-12

The short answer

Saturday, September 12, 2026, is 1 Tishrei 5787, Rosh Hashanah of the Hebrew year 5787. To convert, enter a Gregorian date and see the Hebrew day, month and year, or switch direction. A Hebrew date begins at sundown, so for an evening event check "after sundown" to get the next Hebrew day.

How it is calculated

Hebrew year = Gregorian year + 3760 (January to the fall), or + 3761 (from Rosh Hashanah to December)

The converter reads each day from the Hebrew calendar built into your browser, which follows the fixed rules of the calculated Jewish calendar. For Hebrew to Gregorian it finds Rosh Hashanah of that year, then the first day of the month you chose, then counts forward.

Worked example

Sarah in Toronto wants the Hebrew date of her daughter's birth, which happened at 9 p.m. on March 22, 2027.

  1. In daytime, March 22, 2027, is 13 Adar II 5787
  2. The birth was after sundown, so the Hebrew date had already moved to the next day: 14 Adar II 5787
  3. 5787 is a leap year, so the month is Adar II, not Adar
  4. That Hebrew day lasts until sundown on Tuesday, March 23, 2027

Her daughter's Hebrew birthday is 14 Adar II 5787, which is also Purim that year.

Quick reference table

Months of the Hebrew year 5787 (a leap year of 385 days); each month begins at sundown the evening before the date shown
Hebrew monthFirst dayDays
TishreiSaturday, September 12, 202630
CheshvanMonday, October 12, 202630
KislevWednesday, November 11, 202630
TevetFriday, December 11, 202629
ShevatSaturday, January 9, 202730
Adar IMonday, February 8, 202730
Adar IIWednesday, March 10, 202729
NisanThursday, April 8, 202730
IyarSaturday, May 8, 202729
SivanSunday, June 6, 202730
TammuzTuesday, July 6, 202729
AvWednesday, August 4, 202730
ElulFriday, September 3, 202729

Special cases and common mistakes

  • The day starts at sundown. A Hebrew date runs from sunset to the next sunset. Something that happens on a Tuesday evening after sundown falls on Wednesday's Hebrew date. Check "after sundown" for evening births, weddings and yahrzeits.
  • Leap years have two Adars. Seven years in every 19-year cycle (years 3, 6, 8, 11, 14, 17 and 19) add a 13th month. Those years have Adar I and Adar II instead of Adar; Purim then falls in Adar II.
  • The year number changes in the fall. The Hebrew year starts on 1 Tishrei (Rosh Hashanah), not in January. Year 5787 began on September 12, 2026, and 5788 begins on October 2, 2027.
  • Months are 29 or 30 days. Cheshvan and Kislev change length from year to year, so a date such as 30 Cheshvan exists in some years only. The converter flags dates that do not exist.
  • Month names vary in spelling. You may see Tishri or Tishrei, Heshvan or Cheshvan, Tamuz or Tammuz. They are the same months.

Frequently asked questions

What is today's Hebrew date?

Click "Today's date" in the converter to fill in today and see the Hebrew date for daytime hours. After sundown, check the box to see the Hebrew date that has already begun.

What Hebrew year is it now?

From September 12, 2026 until October 1, 2027, it is the Hebrew year 5787. The year number changes at Rosh Hashanah each fall, so add 3761 to the Gregorian year from the fall onward and 3760 before it.

How do I find my Hebrew birthday?

Choose Gregorian to Hebrew, enter your date of birth, and check "after sundown" if you were born in the evening after sunset. The result is your Hebrew birthday; it falls on a different Gregorian date each year.

Is 5787 a Jewish leap year?

Yes. 5787 has 13 months, with Adar I and Adar II, and 385 days. The next common year, 5788, has 12 months.

Why does the Hebrew date change at sundown?

In the Jewish calendar a day runs from sundown to sundown, rather than midnight to midnight. That is why Shabbat and holidays start on the evening before the date on a wall calendar.

How far back and forward does the converter work?

From 1900 to 2200 (Hebrew years 5661 to 5960). The calculation follows the fixed rules of the Jewish calendar, so dates within that range are exact, not estimates.

Sources

Written and reviewed by the Toolida team. How we review our tools