Solar Hijri Shamsi to Gregorian Converter — Iranian Calendar
Convert any date between the Iranian Solar Hijri (Shamsi) calendar and the Gregorian calendar. The tool shows today's Shamsi date live in Persian (Farsi) script at the top. Furthermore, each result shows the month name in both English and Persian, the Iranian season and the full Shamsi date notation used on Iranian official documents, contracts and government communications.
How to use the Solar Hijri Shamsi Converter
Solar Hijri versus Islamic Hijri calendar
Iran uses two different Hijri calendars for different purposes. Furthermore, the Solar Hijri (Shamsi) calendar is the official civil calendar — aligning with the solar year. The Islamic Hijri (Qamari) calendar is the religious lunar calendar — used for Islamic observances.
| Calendar | Type | New year | Year in 2025 | Used for |
|---|---|---|---|---|
| Solar Hijri (Shamsi) | Solar | ~21 March (Nowruz) | 1404 AP | Civil and official dates in Iran |
| Islamic Hijri (Qamari) | Lunar | 1 Muharram (shifts ~11 days/year) | 1446–1447 AH | Religious observances in Iran and globally |
How the Solar Hijri calendar works
The Solar Hijri calendar uses the same algorithm as the Jalali calendar. Furthermore, the year starts at Nowruz — the vernal equinox — approximately 21 March in the Gregorian calendar. The Shamsi year is approximately 621 to 622 years behind the Gregorian year.
Months 1–6 = 31 days (Farvardin–Shahrivar: spring and summer)
Months 7–11 = 30 days (Mehr–Bahman: autumn and winter)
Month 12 (Esfand) = 29 days normal, 30 days in Solar Hijri leap year
Worked example: converting an Iranian contract date
An Iranian business contract shows the signing date as "15 Shahrivar 1404". Converting this for an international legal document:
| Iranian (Shamsi) | Gregorian equivalent |
|---|---|
| 15 Shahrivar 1404 AP | 6 September 2025 |
| 1 Farvardin 1404 AP (Nowruz) | 21 March 2025 |
| 30 Esfand 1404 AP (year-end) | 21 March 2026 |
What is the Solar Hijri (Shamsi) calendar?
The Solar Hijri calendar — called Taqvim-e Shamsi in Persian (تقویم شمسی) — is the official civil calendar of Iran and Afghanistan. Furthermore, it is a solar calendar counting years from the Hijra of the Prophet Muhammad (PBUH) in 622 CE, but aligned with the solar year rather than the lunar year. The word "Shamsi" means "solar" in Persian.
The calendar begins each year at Nowruz — the Persian New Year — which falls on the vernal equinox. Furthermore, all official Iranian documents, legal records, government publications, bank statements and contracts use the Shamsi date. Moreover, news broadcasts in Iran announce the Shamsi date daily alongside the Islamic Hijri date for religious reference.
Nowruz — the Iranian New Year
Nowruz (meaning "New Day") is the Persian New Year — celebrated on the first day of Farvardin (approximately 21 March) at the exact moment of the vernal equinox. Furthermore, Nowruz is one of the world's oldest celebrations — pre-dating Islam by over two thousand years. Moreover, it is observed not just in Iran but also in Afghanistan, Azerbaijan, Kazakhstan, Tajikistan, Uzbekistan and Kurdish communities worldwide — all of whom share the ancient Persian cultural heritage.
Why Shamsi calendar conversion matters
Iran is a major economy with significant international trade — particularly in oil, gas, petrochemicals and agricultural products. Furthermore, every Iranian legal document, contract, invoice and regulatory filing carries a Shamsi date. International companies dealing with Iranian entities must convert these dates for their own Gregorian-calendar accounting, legal and compliance systems. Moreover, the Shamsi year is 621 to 622 years behind the Gregorian year — a substantial offset that creates real confusion without a converter.
Nowruz — the Iranian New Year around 21 March — is a major disruption period for Iranian business. Furthermore, the Nowruz holiday typically runs for at least 13 days (1 to 13 Farvardin). Teams coordinating with Iranian partners must plan around this closure. Moreover, the pre-Nowruz period in the final week of Esfand (late February/early March) also sees reduced business activity as Iranians prepare for the new year.
Nowruz in international business context
Iran is not the only country affected by Nowruz. Furthermore, Afghanistan, Central Asian countries and Kurdish regions also observe Nowruz as a national holiday. Moreover, Kurdish communities in Turkey, Iraq and Syria celebrate Nowruz on 21 March. Any business with supply chains or partnerships across this broad region must account for the Nowruz holiday period each year.
Frequently asked questions
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