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Here’s a clear and practical piece on converting to Miladi (Gregorian calendar) .
Converting between the Solar Hijri and Gregorian calendars is not a straightforward arithmetic problem. It requires an understanding of their different leap year rules and epochal offsets. The difference in year values between the two calendars is ; it fluctuates depending on the specific date, shifting between a difference of 621 and 622 years.
No need for manual math – this library handles leap years and equinox accurately.