Tehran to Tokyo Time
IRST to JST Converter — 9 AM IRST is 2:30 PM JST
Tehran is 5 hours and 30 minutes behind Tokyo. Convert any time between Tehran (IRST/IRDT) and Tokyo (JST) instantly.
Tehran
Iran
Tokyo
Japan
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Time Zone Comparison
Tehran to Tokyo Time Conversion Table
| Tehran (IRST) | Tokyo (JST) |
|---|---|
| 12:00 AM | 5:30 AM |
| 2:00 AM | 7:30 AM |
| 4:00 AM | 9:30 AM |
| 6:00 AM | 11:30 AM |
| 8:00 AM | 1:30 PM |
| 10:00 AM | 3:30 PM |
| 12:00 PM | 5:30 PM |
| 2:00 PM | 7:30 PM |
| 4:00 PM | 9:30 PM |
| 6:00 PM | 11:30 PM |
| 8:00 PM | 1:30 AM |
| 10:00 PM | 3:30 AM |
Tehran & Tokyo — Business & Scheduling Guide
Tehran (Iran) is an important regional economy, with key industries in diverse sectors including services and trade. Tokyo (Japan) is the world's third-largest economy, known for automotive, electronics, robotics, and precision instruments. With a 5.5-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Tehran and Tokyo
The 5.5-hour difference between Tehran and Tokyo requires careful scheduling. The best overlap window is typically 2–4 hours when both cities are within working hours. Business hours typically follow a 9 AM–5 PM schedule. Japanese business culture places high value on respect and hierarchy, with typical hours of 9 AM–6 PM. Teams often designate specific "overlap hours" for real-time collaboration and use asynchronous communication (Slack, email, recorded video) for the rest of the day.
Daylight Saving Time Considerations
Tehran observes Daylight Saving Time (IRST/IRDT), but Tokyo does not — it stays on JST year-round. This means the time difference between Tehran and Tokyo changes by 1 hour when Tehran switches clocks. During Iran's summer, the gap is 4.5–6.5 hours instead of the standard 5.5 hours. Mark DST transition dates on your calendar to avoid missed meetings.
IRST to JST — Quick Reference
IRST (IRST/IRDT) stands for the timezone used in Tehran, Iran (UTC+3:30). JST (JST) is the timezone used in Tokyo, Japan (UTC+9). Tehran is 5 hours and 30 minutes behind Tokyo.
To convert IRST to JST, add 5.5 hours to IRST time. For example, IRST 9:00 AM = JST 2:30 PM.
Key Facts
- •Time difference: Tehran (UTC+3:30) is 5 hours and 30 minutes behind Tokyo (UTC+9).
- •Daylight Saving Time: Tehran observes DST (IRST/IRDT). Tokyo does not observe DST (JST).
- •Regions: Tehran is located in Iran and uses the IRST/IRDT time zone. Tokyo is located in Japan and uses the JST time zone.
- •Best time to call: The best time to call between Tehran and Tokyo is 9:00 AM to 11:00 AM in Tehran time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Tehran and Tokyo?
Tehran is 5 hours and 30 minutes behind Tokyo.
What time is it in Tokyo when it's 9 AM in Tehran?
When it's 9:00 AM in Tehran, it is 2:30 PM in Tokyo.
What time is 9 PM IRST in JST?
9 PM IRST (Tehran time) is 2:30 AM JST (Tokyo time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Tehran and Tokyo?
The best time to schedule a meeting is between 9:00 AM to 11:00 AM in Tehran time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert IRST to JST?
IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). JST (JST) is the timezone for Tokyo, Japan (UTC+9). Tehran is 5 hours and 30 minutes behind Tokyo. Quick examples: 9 AM IRST = 2:30 PM JST, 12 PM IRST = 5:30 PM JST, 3 PM IRST = 8:30 PM JST, 6 PM IRST = 11:30 PM JST.
Is Tehran ahead of or behind Tokyo?
Tehran is 5 hours 30 minutes behind Tokyo. When it's noon in Tehran, it's 5:30 PM in Tokyo.
Does Tehran or Tokyo change clocks for Daylight Saving Time?
Yes, Tehran observes DST and switches between IRST/IRDT. Tokyo does not observe DST — it stays on JST year-round. Because only one city observes DST, the time difference shifts by 1 hour during transition periods (typically March/April and October/November).
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