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Which Hijri program do you use to calculate the Hijri dates?

April 26, 2017CALCULATE dates hijri program

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Which Hijri program do you use to calculate the Hijri dates?

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For Hijri year 1420 and above we use an advanced program written by a group of researchers in astronomy. Usually the program gives very accurate results according to Makkah. For Hijri years less than 1420 we use a program called Hdate written by Waleed Muhanna. Hdate may give an error of plus or minus one day.