Rosh Hashanah Date Calculator
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Hebrew calendar estimate. Holidays begin at sunset on the prior Gregorian evening. Diaspora and Israel observance lengths may differ — confirm with your community calendar.
Gregorian year → Rosh Hashanah date (1 Tishrei) from Hebrew calendar calculation.
Rates last reviewed: August 2026
Gregorian year
Rosh Hashanah (1 Tishrei)
2026-09-12
Hebrew year 5,787 begins at sunset the prior evening
- Gregorian date
- 2026-09-12
- Hebrew year
- 5,787
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When is Rosh Hashanah?
Rosh Hashanah is 1 Tishrei — the first day of the Hebrew year, observed as two days in Israel and the Diaspora alike. It is set by the lunisolar Hebrew calendar using the molad (new moon) and postponement rules, not by a fixed Gregorian date.
The holiday begins at sunset the evening before the listed Gregorian date. This calculator returns the civil date of 1 Tishrei for the Hebrew year that falls primarily in your chosen Gregorian year.
Example: Rosh Hashanah usually falls in September or October. Pair with the Passover calculator for other major festivals or the live Passover countdown for planning from today.
Official sources
Rates and formulas in this calculator reference the documentation below. Confirm current numbers on the source site before relying on them. Links do not imply endorsement by those organizations of Calcometry or this tool.
Common questions
Why does Rosh Hashanah move on the Gregorian calendar?
The Hebrew calendar adds leap months in a 19-year cycle to keep months aligned with seasons. 1 Tishrei shifts on the solar Gregorian chart.
Is this the same as every synagogue calendar?
Community calendars follow the same core Hebrew rules; this is a standard algorithm estimate. Confirm candle-lighting times locally.