Global markets run on the Gregorian calendar. If you are scheduling meetings, processing contracts, or finalizing financial quarters with European or American partners, using Miladi dates prevents confusion.
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Tarikh Shamsi b Miladi: Finding a Better Way to Convert Persian to Gregorian Dates
1 Farvardin 1405 SH = March 20, 2026 CE (or March 21 depending on equinox). tarikh shamsi b miladi better
Unlike basic scripts that simply add 621 to the year and sum days (which drifts over time due to leap year mismatches), this code converts the date into a Julian Day Number (JDN) . This is the standard astronomical method for date conversions, ensuring high precision over centuries.
If you’re wondering why "Tarikh Shamsi" might be considered "better" than "Miladi," or vice-versa, here is a deep dive into the mechanics, history, and logic of both. 1. Astronomical Precision: The Edge of Tarikh Shamsi
: The Gregorian calendar uses a fixed mathematical rule to determine leap years. Because its formula does not perfectly match the true time it takes for Earth to orbit the Sun (the tropical year), it drifts forward by 27 seconds every year. This means the Miladi calendar accumulates a full day of error every 3,236 years . Global markets run on the Gregorian calendar
: The year starts at the exact second the Sun enters the vernal equinox, a global event celebrated simultaneously everywhere on Earth. Zero Seasonal Drift
The Solar Hijri calendar is an observation-based system. It calculates the precise moment of the vernal equinox using astronomical observations in Kabul and Tehran. Because it relies on the actual movement of the earth around the sun, its entry into the new year is mathematically perfect.
The “divisible by 4, except centuries not divisible by 400” is easy to compute. Shamsi leap years require astronomical observation or complex tables, making it harder to predict far in advance. Unlike basic scripts that simply add 621 to
The answer to "Which calendar is better?" is highly dependent on the context.
jalcal: an R package to convert Jalaali and Gregorian calendar dates