How does the Hebrew calendar handle leap years?

The Hebrew calendar adds a 13th month (Adar I and Adar II) in 7 of every 19 years. This converter applies the fixed molad-based rules including the four postponements (dehiyyot), so leap years and month lengths are computed correctly.

How accurate is this converter?

It uses the standard arithmetic (fixed) Hebrew calendar via the Julian Day Number, matching the calendar in universal civil and religious use. The Hebrew day begins at sunset, so dates after nightfall belong to the following Hebrew day.

Does my date leave my device?

No. The converter is privacy-first — every calculation runs locally in your browser and nothing is sent or stored.

Hebrew Calendar Converter

Hebrew calendar converter

Convert any Gregorian date to the Hebrew (Jewish) calendar. The tool shows the day, the Hebrew month and the Anno Mundi (AM) year.

It uses the fixed, molad-based Hebrew calendar with the four postponement rules (dehiyyot), pivoting through the Julian Day Number for an exact result. In a leap year, Adar is split into Adar I and Adar II.

Because the Hebrew day begins at sunset, a civil date near nightfall may correspond to the following Hebrew day. It is privacy-first: nothing leaves your browser.