Time in Tehran, Iran

Tehran, the capital of Iran, operates on Iran Standard Time (IRST), which is UTC+3:30 — one of the relatively rare half-hour offsets used anywhere in the world. This places Tehran 30 minutes ahead of its immediate neighbours in Riyadh and the Gulf states (which use UTC+3), and 30 minutes behind Dubai and the UAE (UTC+4).

Iran historically observed daylight saving time (IRDT, UTC+4:30) each spring and autumn, but daylight saving was permanently abolished in 2023. Since then, IRST at UTC+3:30 applies throughout the entire year, removing the seasonal clock changes that had been in place for decades.

With a population of over 9 million in the city proper and more than 16 million in the greater metropolitan area, Tehran is one of the largest cities in Western Asia. It sits at an elevation of roughly 1,200 metres above sea level at its centre, rising to over 1,800 metres in its northern districts near the Alborz mountain range — a geography that gives the city notably cooler summers than the desert cities further south.

For comparison with neighbouring regions: when it is noon in Tehran, it is 11:30 AM in Riyadh (Saudi Arabia), 11:30 AM in Kuwait City, 12:00 PM in Dubai, and 9:30 AM in Central European Time. The half-hour offset is small but significant enough to add an extra mental step to any scheduling across the region.

Tehran's half-hour offset from UTC+3 makes US–Iran scheduling slightly more unusual than most international calls. Because Iran no longer observes DST, the gap changes only when the United States adjusts its clocks in spring and autumn.

The half-hour offset produces some unusual clock readings. For example: when it is 9:00 AM in New York on a winter morning, it is 5:30 PM in Tehran — not 5:00 or 6:00, but right in between. When New York is at noon, Tehran is at 8:30 PM. These off-the-hour figures mean that automated calendar tools sometimes struggle to display Tehran times cleanly.

A practical calling window: 6:30 AM–9:30 AM Eastern Time in winter corresponds to 3:00 PM–6:00 PM in Tehran, giving a comfortable afternoon overlap. In summer (when the US moves to EDT), that window shifts to 5:30 AM–8:30 AM Eastern for the same Tehran afternoon window — very early for New York, which is why many Iran–US business calls happen late morning Tehran time.

Use the World Clock to view live Tehran time alongside any US city in real time.

Tehran is a city of striking contrasts — ancient bazaars alongside modernist architecture, snow-capped mountains visible from urban traffic jams, and a population of young, educated Iranians shaping a vibrant cultural underground. For visitors and business travellers, understanding the city's scale and layout matters: Tehran sprawls across more than 700 square kilometres.

Key landmarks and experiences include:

• Grand Bazaar of Tehran — one of the largest covered bazaars in the world, with over 10 kilometres of corridors housing thousands of shops trading everything from spices and gold to carpets and electronics. It connects to the historic Imam Khomeini Square and dates back centuries.
• Golestan Palace Complex — a UNESCO World Heritage Site and the oldest historic monument in Tehran, serving as the royal residence of the Qajar dynasty. Its mirror halls, gardens, and museums offer a window into 19th-century Persian court life.
• Milad Tower — standing at 435 metres, it is among the tallest towers in the world and offers panoramic views across Tehran to the Alborz mountains to the north.
• Darband — a pedestrianised mountain trail in north Tehran, popular for hiking and teahouse stops, offering a complete contrast to the city below.
• Tajrish Bazaar — a more neighbourhood-scale market in north Tehran, surrounded by local restaurants and the Imamzadeh Saleh shrine.

Tehran's traffic is notorious — the city has one of the highest car ownership rates in the world relative to its road infrastructure. The metro system covers most key districts and is the recommended way to travel during rush hours. Air quality can be poor in winter due to temperature inversions trapping pollution against the mountains.

Iran uses the Solar Hijri calendar (also called the Persian or Jalali calendar) as its official civil calendar. This is distinct from both the Gregorian calendar used internationally and the Islamic lunar Hijri calendar. The Solar Hijri year begins on the spring equinox — around March 20 or 21 in Gregorian terms — and its year count currently runs approximately 621 years behind the Gregorian count (so 2025 in the Gregorian calendar corresponds to 1404 in the Solar Hijri calendar).

This means that when you schedule a meeting with an Iranian business contact, documents and correspondence may carry Persian calendar dates rather than Gregorian ones. Most international-facing Iranian businesses include both date systems, but it is worth confirming.

The most important cultural time marker in Iran is Nowruz, the Persian New Year, celebrated on the spring equinox (around March 20–21). Nowruz is a 13-day national holiday — arguably the most significant festive period in Iranian culture, predating Islam by thousands of years. Businesses close, families travel, and cities empty as people return to their home provinces. Planning any business activity during the first two weeks of the Persian New Year is inadvisable.

Other notable cultural time events include Yalda Night (Shab-e Yalda) on the winter solstice — the longest night of the year — celebrated with family gatherings, poetry readings (especially Hafez), and seasonal foods like pomegranates and watermelons. Friday is the official day of rest and prayer. The literary culture around poets such as Hafez, Rumi (Molana), and Ferdowsi remains deeply embedded in everyday Iranian life — poetry is not merely academic but a living part of conversation.

Imam Khomeini International Airport (IATA: IKA) is Tehran's main international gateway, located approximately 55 kilometres south of the city centre — a significant distance that means airport-to-city transfers can take 45 to 90 minutes depending on traffic. A metro line (Line 1 extension) connects the airport to central Tehran, making it possible to reach the city by rail in about an hour.

Mehrabad Airport (IATA: THR) is Tehran's domestic airport, located within the city itself. It handles most internal Iranian flights to cities such as Mashhad, Shiraz, Isfahan, and Tabriz.

There are no direct commercial flights between the United States and Iran. The most common connection cities for travelling from the US to Tehran include:

• Istanbul (IST) — approximately 3 hours from Tehran; Turkish Airlines operates multiple daily flights
• Dubai (DXB) — approximately 2 hours from Tehran; flydubai and Iranian carriers serve this route
• Doha (DOH) — approximately 2 hours from Tehran; Qatar Airways connects onward to US cities
• Frankfurt (FRA) — approximately 5.5 hours from Tehran; Lufthansa and Mahan Air serve this route

Total travel time from JFK to Tehran typically ranges from 13 to 16 hours with a single connection, depending on layover duration. US citizens require a visa to enter Iran, and there are currently no US–Iran diplomatic relations, meaning the visa must be obtained through a third-country Iranian embassy or via a tour operator offering visa-on-arrival arrangements. Always check current travel advisories before planning a trip.

Compare Tehran's time with its neighbours using the time in Dubai page, or explore the World Clock for a full global overview.