Current Local Time in Tehran
Tehran, Iran (GMT+3:30)
Sunday, May 10, 2026
Tehran is located in the Asia/Tehran timezone in Iran.
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⏰Time Zone Facts
Asia/TehranData: IANA Time Zone Database
☀️Climate
Semi-arid with hot dry summers (32-38°C) and cold winters (0-8°C). Snow possible in winter.
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📍About Tehran Time Zone
Tehran Time Zone Guide
Tehran operates in Iran Standard Time (IRST), positioned at UTC+3:30—one of only a few half-hour offset timezones globally. This unique 30-minute deviation places Iran precisely between standard hourly timezone boundaries, reflecting its longitude position in the Middle East. As of 2022, Iran no longer observes daylight saving time, maintaining IRST year-round after decades of seasonal clock changes that followed the Persian solar calendar. The elimination of DST simplifies international coordination for businesses and travelers dealing with Tehran, though it creates shifting time differences with countries that still observe seasonal changes. Tehran's timezone encompasses all of Iran, from the Caspian Sea coast to the Persian Gulf, providing uniform timekeeping across the nation's diverse geography. The half-hour offset means Tehran shares no exact timezone with major global financial centers, requiring careful calculation for international meetings and financial trading. Understanding Tehran's IRST designation is essential for scheduling video conferences, planning travel itineraries, and coordinating with Iranian business partners across sectors from energy to technology.
Business Hours in Tehran
Tehran's business culture operates on a Saturday-to-Wednesday workweek, distinctly different from Western Monday-to-Friday schedules. Standard office hours run from 8:30 AM to 5:00 PM IRST, though many private companies adopt flexible schedules. Thursday is a half-day in most sectors, with businesses closing around noon, while Friday serves as the official weekend day when most commercial activity ceases. Government ministries and public institutions typically operate 7:30 AM to 2:30 PM, front-loading productivity into morning hours. Tehran's banking sector maintains stricter schedules, opening at 8:00 AM and closing by 4:00 PM on working days, with limited Thursday operations. Retail presents a contrasting pattern—traditional bazaars like the Grand Bazaar operate morning through early evening, while modern shopping malls in districts like Elahieh and Zafaraniyeh stay open until 9:00 PM or 10:00 PM. The Tehran Stock Exchange operates morning-only sessions from 9:00 AM to 12:30 PM, concentrating trading into a compact 3.5-hour window. International businesses coordinating with Tehran must account for the Friday closure and Thursday half-day when scheduling deliverables, conference calls, or expecting responses to time-sensitive communications across global supply chains.
Calling Tehran Internationally
Connecting with Tehran from international locations requires strategic timing to bridge Iran's UTC+3:30 offset with global business centers. From the US East Coast, the optimal calling window is 6:00 AM to 10:00 AM EST (2:30 PM to 6:30 PM in Tehran), catching Tehran's afternoon business hours before American workdays begin. West Coast callers face more challenging timing, with 3:00 AM to 7:00 AM PST providing the only overlap with Tehran business hours—making email often more practical for California-based contacts. European coordination proves easier: London-based professionals can reach Tehran from 11:00 AM to 2:00 PM GMT, while Paris and Frankfurt operate on nearly parallel schedules. Asian time zones offer morning-to-morning alignment—Tokyo contacts can call Tehran from 6:00 PM to 9:00 PM JST, though this pushes into Tehran's early evening. Remember Iran's unique workweek: Saturday through Wednesday are business days, with Thursday half-days and Friday closures. When scheduling recurring calls with Tehran counterparts, Wednesday morning Tehran time (Tuesday evening in New York, Tuesday night in California) often provides the most reliable overlap. International calling to Tehran requires dialing +98 (Iran's country code) followed by 21 (Tehran's area code) and the local number, with VoIP services offering cost-effective alternatives to traditional international rates for frequent business communication.
Tehran's Unique Half-Hour Timezone
Iran's UTC+3:30 timezone places Tehran in an exclusive global club of half-hour offset zones, shared only with Afghanistan (UTC+4:30) and a few locations in India and Myanmar. This 30-minute deviation from standard hourly timezones originated from geographic and political considerations—Iran's longitude position logically places it between UTC+3 and UTC+4 zones, and the half-hour offset asserts distinct national timekeeping identity. For international business, Tehran's half-hour offset creates unique scheduling challenges: conference calls rarely align with standard hour markers, making 10:30 AM or 2:30 PM common meeting times rather than on-the-hour starts. Digital calendar systems and world clocks must specifically account for IRST rather than rounding to nearby zones. The half-hour difference compounds when calculating flight times, with arrivals and departures from Tehran often showing unusual minute markers like :20 or :50 rather than standard :00 or :30 times. Financial markets experience particular complexity—the Tehran Stock Exchange trading hours don't align neatly with European opening bells or American pre-market trading, creating distinct arbitrage windows. Technology systems, from scheduling software to payment processing platforms, must properly recognize Asia/Tehran in the IANA timezone database to avoid systematic 30-minute errors that could disrupt operations, appointments, and automated processes across international business relationships.
Tehran Time Difference at a Glance
Quick Facts: Tehran Time
- Time Zone: Iran Standard Time (+3:30)
- Daylight Saving: Not observed
- Country: Iran
- Coordinates: 35.69, 51.39
- Calling Code: +98 21
Last updated: March 2025 | ✓ Verified by WhatTime.city Editorial Team | Timezone data sourced from IANA Time Zone Database.
🌐Time Difference from Tehran
| City | Now | Diff | Overlap |
|---|---|---|---|
| 🌆New York | 6:30 PM | -7:30 | |
| 🌙London | 11:30 PM | -2:30 | |
| 🌅Tokyo | 7:30 AM | +5:30 | |
| 🌙Paris | 12:30 AM | -1:30 | |
| 🌙Dubai | 2:30 AM | +0:30 | |
| 🌅Singapore | 6:30 AM | +4:30 | |
| 🌅Hong Kong | 6:30 AM | +4:30 | |
| 🌅Shanghai | 6:30 AM | +4:30 |
❓Frequently Asked Questions
Tehran, Iran uses Iran Standard Time (IRST, UTC+3:30) in winter and Iran Daylight Time (IRDT, UTC+4:30) during DST. The IANA identifier is Asia/Tehran. Iran uses a unique half-hour offset timezone, making Tehran 3 hours and 30 minutes ahead of Coordinated Universal Time. This distinctive offset is shared by only a handful of locations worldwide and reflects Iran's geographic position.
Tehran is in Iran Standard Time (IRST), which is UTC+3:30 year-round. Iran formerly observed daylight saving time (Iran Daylight Time/IRDT at UTC+4:30) but discontinued the practice in 2022. Tehran now maintains a consistent 3.5-hour offset ahead of UTC throughout the year.
No. Iran discontinued daylight saving time in 2022 after decades of observation. Tehran now remains on Iran Standard Time (IRST/UTC+3:30) year-round, eliminating the twice-yearly clock changes that previously occurred in March and September according to the Iranian solar calendar.
Tehran is 8.5 hours ahead of New York during Eastern Standard Time (EST) and 7.5 hours ahead during Eastern Daylight Time (EDT). When it's noon in New York, it's 8:30 PM in Tehran during winter months and 7:30 PM during summer months. This offset fluctuates because the US observes DST while Iran does not.
Tehran is 3.5 hours ahead of London during Greenwich Mean Time (GMT) and 2.5 hours ahead during British Summer Time (BST). When it's 12:00 PM in London, it's 3:30 PM in Tehran in winter and 2:30 PM in summer. The time difference narrows during UK summer months due to British clock changes.
The Tehran Stock Exchange (TSE) opens at 9:00 AM IRST and closes at 12:30 PM IRST on Saturday through Wednesday. Trading sessions last 3.5 hours with pre-opening procedures starting at 8:30 AM. Iran's weekend falls on Friday, making the TSE closed on Thursdays and Fridays, unlike Western stock exchanges.
Call Tehran between 6:00 AM and 10:00 AM US Eastern Time to reach standard business hours (2:30 PM - 6:30 PM in Tehran). From the West Coast, call between 3:00 AM and 7:00 AM Pacific Time. Schedule calls on Saturday through Wednesday, as Friday is Iran's weekly holiday and most businesses are closed Thursday afternoon.
Tehran businesses typically operate Saturday through Wednesday from 8:30 AM to 5:00 PM IRST, with many closing Thursday at noon. Government offices work 7:30 AM to 2:30 PM. Friday is the official weekly holiday. Banks open 8:00 AM to 4:00 PM, while retail shops often stay open until 9:00 PM, especially in commercial districts like Vanak and Tajrish.
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