Afghanistan uses three different calendars,
and calendars printed in Afghanistan have all three systems printed
on the same page.
The Gregorian calendar is the one used world-wide, but it originally
came from Pope Gregory in 1582 to replace the unwieldy Julian
calendar. Catholic countries adopted it and others slowly followed
suit (e.g. England - 1752, Japan - 1873, China - 1911, USSR -
1923).
The Shamsi (secular) calendar is a solar calendar which has
the same 12 months but the first day of the month occurs on about
the 21st to 23rd day of the Gregorian month.
The Qamari is a lunar calendar, which means that the months
occur 11 days earlier each year. Ramazan (Ramadan) is the month
of fasting. The Muslim world uses variants of Arabic names for
the Qamari months.
Both Shamsi and Qamari calendars date from the Hijra (Mohammed's
pilgrimage to Mecca). The year 1 corresponds to 622 A.D.
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