About the three calendars
Gregorian. The solar calendar used for civil dates in most of the world, with 365 days and a leap day every four years, except most century years.
Hijri (Islamic). A lunar calendar of 12 months that have 29 or 30 days each, so a year is about 354 days. Hijri dates move about 11 days earlier in the Gregorian calendar each year, which is why Ramadan shifts through the seasons. Years are counted from the Hijra in 622 CE and marked AH.
Hebrew (Jewish). A lunisolar calendar. Months follow the moon, but a leap month, Adar I, is added seven times in every 19 years so that festivals stay in their seasons. The year begins at Rosh Hashanah in Tishri, and years are marked AM.
Accuracy notes
Why might a Hijri date differ by a day from my local calendar?
This converter uses the Umm al-Qura calendar, the official calendar of Saudi Arabia, which is calculated in advance. Many communities start each month by sighting the new moon, so local religious dates such as the start of Ramadan or Eid can differ by a day.
When does a Hebrew date begin?
A Hebrew day starts at sunset. The converter shows the Hebrew date for the daytime of the Gregorian date. For an event after sunset, such as a birth in the evening, use the next Hebrew date.
What range of dates is supported?
Hijri years 1300 to 1600 AH, roughly 1882 to 2174 CE. Hebrew dates are supported across the same span.