Tehran Time
Tehran Time
Tehran uses Iran Standard Time (IRST, UTC+3:30) in winter and Iran Daylight Time (IRDT, UTC+4:30) in summer. Iran is one of few countries with a half-hour UTC offset. Tehran is the political, economic, and cultural capital of Iran.
Why people check Tehran time
Common reasons to track the current time in Tehran.
Iranian oil & gas sector
Iran is a major oil and gas producer. Energy traders globally track IRST/IRDT for Iranian production news and geopolitical developments.
Government & diplomacy
Tehran is the seat of Iranian government. Diplomatic missions and international journalists track IRST/IRDT for official announcements and negotiations.
Regional tech & commerce
Iran has a large domestic tech ecosystem. Regional business partners track IRST/IRDT for Iranian market hours and consumer trends.
Cultural tourism
Iran's ancient history, Persepolis, Isfahan, and bazaars attract cultural tourists. Travellers convert the unusual half-hour offset for guided tours.
Tehran Time — FAQ
Why does Tehran have a half-hour UTC offset?
Iran's UTC+3:30 offset (IRST) dates back to 1946 as a compromise between local solar time and neighbouring time zones. The half-hour offset has been maintained since.
Does Tehran observe daylight saving time?
Yes. Iran uses IRST (UTC+3:30) in winter and IRDT (UTC+4:30) in summer, following the Persian calendar for its DST transition dates.
How many hours ahead of London is Tehran?
Tehran is 3.5 hours ahead of London in winter (GMT) and 3.5 hours ahead in summer too, since Iran moves its clocks by 1 hour as does London, keeping the gap the same.
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