Convert dates between the Gregorian and Hijri (Islamic lunar) calendars.
This converter translates dates between the Gregorian calendar (the standard civil calendar used internationally) and the Hijri calendar (the lunar calendar used for Islamic religious observances and in several countries for civil purposes). You can convert in either direction: enter a Gregorian date to see its Hijri equivalent, or enter a Hijri day, month and year to see the corresponding Gregorian date.
The Hijri calendar is purely lunar, made up of twelve months that each follow the moon's cycle, totaling about 354 or 355 days a year — roughly 10 to 11 days shorter than the Gregorian solar year. Because of that gap, Hijri dates drift steadily earlier relative to the Gregorian calendar year after year, and a Hijri new year can fall in a different Gregorian month each time rather than on a fixed date.
The conversion uses the tabular Islamic calendar, a well-established arithmetic approximation that assigns leap days across a repeating 30-year cycle to keep the calculation consistent and predictable. This is the same method used by many software libraries and calendar apps for calculation purposes. It's important to note this is a calculated approximation rather than a moon-sighting-based determination — some communities and religious authorities determine the start of each Hijri month based on the actual physical sighting of the crescent moon, which can shift the observed date by a day in either direction from the tabular calculation.
Converting Gregorian to Hijri is useful for checking which Islamic month and year a specific Western calendar date falls in — for example, working out what Hijri year your birth date falls in. Converting Hijri to Gregorian is useful for the reverse: translating a Hijri date from a document, an inscription, or a religious calendar into its approximate Western calendar equivalent.
This tool uses the tabular (arithmetic) Islamic calendar, a fixed calculation method. Actual religious observance in many communities is based on physical moon sighting, which can differ from the tabular calculation by a day.
Because the Hijri calendar is lunar and roughly 10-11 days shorter than the Gregorian solar year, its dates shift earlier relative to the Gregorian calendar each year, cycling through all four Gregorian seasons over roughly 33 years.
AH stands for Anno Hegirae, Latin for 'in the year of the Hijra', referring to the migration of the Prophet Muhammad from Mecca to Medina in 622 CE, which marks the start of the Hijri calendar.
It's generally within a day of moon-sighting-based determinations, but for exact religious observance dates (such as the start of Ramadan or Eid), always confirm with your local religious authority rather than relying solely on a calculated date.
Yes, the tabular calculation works across the full range of Hijri years, though very old dates may show larger discrepancies from historical moon-sighting records.