The calendar (also called the Solar Hijri or Jalali calendar) is used officially in Iran and Afghanistan. The Miladi (Gregorian) calendar is the international standard.
Actually the real formula is:
The Solar Hijri calendar begins with the Hijra (migration) of Prophet Muhammad in 622 AD. tarikh shamsi b miladi
It consists of 12 months of varying lengths (28 to 31 days), with a leap year adding a day to February every four years. Why the Conversion Varies Every Year
به سال شمسی عدد ۶۲۲ را اضافه کنید تا سال میلادی به دست آید. مثال: ۱ فروردین ۱۴۰۵ →right arrow ۱۴۰۵ + ۶۲۱ = ۲۰۲۶ (January) ۲۰ بهمن ۱۴۰۴ →right arrow ۱۴۰۴ + ۶۲۲ = ۲۰۲۶ (February) The calendar (also called the Solar Hijri or
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The first 6 months have 31 days, the next 5 months have 30 days, and the final month (Esfand) has 29 days (30 in leap years). The Tarikh Miladi (Gregorian Calendar) It consists of 12 months of varying lengths
Here’s an interesting and practical guide to understanding — two of the most widely used calendar systems in the Middle East and the world.
To convert dates effectively, you must first understand the structural and astronomical foundations of both timekeeping systems. The Solar Hijri Calendar (Tarikh Shamsi)