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keisanHigh-precision calculations for everyday life and work

Conversion from the Western calendar to the Hijri calendar

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Converts a period ranging from 1 month to 1 year from the Western calendar (Gregorian and Julian calendars) to the Hijri calendar (Islamic calendar).
Western calendar
A.D.
Year
Month
〜
     ↓   
Hijri calendar
The Hijri (Islamic) calendar is a purely lunar calendar, alternating 30-day and 29-day months, with 11 leap years in a 30-year cycle to keep month starts aligned with the lunar cycle. A Hijri day begins at sunset, running from sunset on the preceding Western-calendar date to sunset on the specified date. Religious authorities may determine dates by observing the new crescent after sunset, so their dates may differ from this calculation.

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