The Islamic (Hijri) calendar is a lunar calendar used to determine religious dates such as Ramadan, Eid, and Hajj, and differs from the Gregorian solar calendar used internationally for civil purposes. This Hijri-Gregorian date converter allows you to convert dates in either direction, find the Gregorian equivalent of a Hijri date, or find the Hijri equivalent of a Gregorian date. Because the Hijri calendar is approximately 11 days shorter than the Gregorian calendar each year, important Islamic dates shift earlier relative to the Gregorian calendar over time. This tool is useful for Muslims planning around religious observances, scheduling events, or simply understanding how dates correspond between the two systems.