Time ZonesAbout this time zone
All of Iran keeps one time. Computers and phones know it by the zone name Asia/Tehran. Its time is UTC+3:30, which means it is 3 hours 30 minutes ahead of Coordinated Universal Time (UTC) all year round. Compared with India (IST), it is 2 hours behind India.
Clock changes in 2026 and 2027
Iran does not change its clocks in 2026 or 2027. The time stays at UTC+3:30 all year, so there is no daylight saving time to remember.
Time difference with major cities
| When it is 12:00 noon in Iran, it is | In January 2026 | In July 2026 |
|---|---|---|
| India | 2:00 pm2 hours ahead | 2:00 pm2 hours ahead |
| United Kingdom | 8:30 am3 hours 30 minutes behind | 9:30 am2 hours 30 minutes behind |
| France | 9:30 am2 hours 30 minutes behind | 10:30 am1 hour 30 minutes behind |
| New York, United States | 3:30 am8 hours 30 minutes behind | 4:30 am7 hours 30 minutes behind |
| Chicago, United States | 2:30 am9 hours 30 minutes behind | 3:30 am8 hours 30 minutes behind |
| Los Angeles, United States | 12:30 am11 hours 30 minutes behind | 1:30 am10 hours 30 minutes behind |
| United Arab Emirates | 12:30 pm30 minutes ahead | 12:30 pm30 minutes ahead |
| Singapore | 4:30 pm4 hours 30 minutes ahead | 4:30 pm4 hours 30 minutes ahead |
| Japan | 5:30 pm5 hours 30 minutes ahead | 5:30 pm5 hours 30 minutes ahead |
| Sydney, Australia | 7:30 pm7 hours 30 minutes ahead | 6:30 pm6 hours 30 minutes ahead |
The table uses the offsets in force in mid January and mid July 2026. Use the converter for any other date.
Clock time and sun time in Iran
A time zone is an agreement, and the sun does not follow it exactly. Tehran, the largest city in this zone, lies at about 51.4° east. Each degree of longitude is worth four minutes, so by the sun alone its time would be about 3 hours 26 minutes ahead of UTC. The clock is set to UTC+3:30. The sun is therefore highest in the sky at about 12:04 pm by the clock, not at 12:00. That is a close match: clock and sun agree to within a quarter of an hour. Other places in the zone, to the east or west of Tehran, see the sun peak a little earlier or later. Through the year the figure also drifts by up to a quarter of an hour either way.
How long the day is
Tehran is about 35.7° north of the equator. On the longest day of the year, around 21 June, the sun is up for about 14 hours 35 minutes. On the shortest, around 21 December, for about 9 hours 44 minutes. That is a swing of about 4 hours 50 minutes between summer and winter, yet the clocks here stay the same all year.
Office hours shared with other places
If both sides work from 9 am to 6 pm, these are the hours when a call falls inside the working day at both ends. Times are for Iran.
- With India, all year: 9:00 am to 4:00 pm here, which is 11:00 am to 6:00 pm in India (7 hours shared).
- With London, in January: 12:30 pm to 6:00 pm here, which is 9:00 am to 2:30 pm in London (5 hours 30 minutes shared). In July: 11:30 am to 6:00 pm here, which is 9:00 am to 3:30 pm in London (6 hours 30 minutes shared).
- With New York, in January: 5:30 pm to 6:00 pm here, which is 9:00 am to 9:30 am in New York (30 minutes shared). In July: 4:30 pm to 6:00 pm here, which is 9:00 am to 10:30 am in New York (1 hour 30 minutes shared).
How many people keep this time
The GeoNames list has 425 towns and cities of 15,000 people or more in this zone area, with about 50 million people between them. People in villages and smaller towns are not in that count, so the true number on this clock is higher.
Cities that keep this time
The largest cities in this zone: Tehran, Mashhad, Isfahan, Karaj, Tabriz, Shiraz, Qom, Ahvaz, Kermanshah, Rasht, Kerman, Orūmīyeh, Zahedan, Hamadān.
The clock above uses your device's clock and the time zone rules built into your browser. Rules on this page: IANA time zone database 2026f. See About and data sources.