The iHijri التقويم الهجري is a convenient way to understand, track, and convert dates according to the Islamic lunar calendar. While the Gregorian calendar is widely used for everyday activities around the world, the Hijri calendar remains essential for Muslims because many important religious occasions are determined by Islamic dates. Ramadan, Eid al-Fitr, Eid al-Adha, Hajj, Ashura, and other significant occasions are connected to the Hijri calendar.