Concept
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Dates and Calendars
Islamic Calendar stamp issued at King Khaled airport (10 Rajab 1428 / 24 July 2007)
The first year was the Islamic year beginning in AD 622, during which the emigration of Muhammad from Mecca to Medina, known as the Hijra, occurred. Each numbered year is designated either "H" for Hijra or "AH" for the Latin Anno Hegirae ("in the year of the Hijra"). Hence, Muslims typically call their calendar the Hijri calendar.
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"King_Khaled_airport_exit_stamp.jpg."
https://en.wikipedia.org/wiki/Islamic_calendar#/media/File:King_Khaled_airport_exit_stamp.jpg
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