✡️ Hebrew Calendar Converter

The Hebrew calendar is a lunisolar calendar used in Jewish tradition and as Israel's official calendar. Each month is based on the lunar cycle (about 29.5 days), and to keep pace with the solar year, a leap month (split into Adar I and Adar II) is added in 7 out of every 19 years (years 3, 6, 8, 11, 14, 17, and 19 of the cycle). Years are traditionally counted from the era of Creation; 2026 in the Gregorian calendar corresponds to Hebrew year 5786.

Gregorian → Hebrew: the browser's Intl.DateTimeFormat API is called with calendar: 'hebrew', and the result computed by the international standard (ICU, Unicode CLDR) is displayed directly. This relies on the browser's built-in, well-tested calendar engine rather than any custom-written calendar arithmetic, which makes it more accurate.

Hebrew → Gregorian: there is no standard API to convert directly from Hebrew to Gregorian, so the tool estimates a Gregorian date near the given Hebrew year, then steps day-by-day forward and backward, converting each candidate date back to Hebrew and comparing it against your input (bounded to at most 800 iterations) until it finds the exact matching Gregorian date.

This feature relies on ICU calendar support built into modern browsers (Chrome, Edge, Firefox, Safari, etc.). Very old or unusual browsers may not support Hebrew calendar calculations, in which case the tool shows a notice. Note that the month of Adar is a single month ("Adar") in common years, but splits into "Adar I" and "Adar II" in leap years — when converting Hebrew → Gregorian, make sure to pick the month option that matches whether the year in question is a common or leap year.