Tokyo to Tehran Time
JST to IRST Converter — 9 AM JST is 3:30 AM IRST
Tokyo is 5 hours and 30 minutes ahead of Tehran. Convert any time between Tokyo (JST) and Tehran (IRST/IRDT) instantly.
Tokyo
Japan
Tehran
Iran
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Time Zone Comparison
Tokyo to Tehran Time Conversion Table
| Tokyo (JST) | Tehran (IRST) |
|---|---|
| 12:00 AM | 6:30 PM |
| 2:00 AM | 8:30 PM |
| 4:00 AM | 10:30 PM |
| 6:00 AM | 12:30 AM |
| 8:00 AM | 2:30 AM |
| 10:00 AM | 4:30 AM |
| 12:00 PM | 6:30 AM |
| 2:00 PM | 8:30 AM |
| 4:00 PM | 10:30 AM |
| 6:00 PM | 12:30 PM |
| 8:00 PM | 2:30 PM |
| 10:00 PM | 4:30 PM |
Tokyo & Tehran — Business & Scheduling Guide
Tokyo (Japan) is the world's third-largest economy, with key industries in automotive, electronics, robotics, and precision instruments. Tehran (Iran) is an important regional economy, known for diverse sectors including services and trade. 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 Tokyo and Tehran
The 5.5-hour difference between Tokyo and Tehran requires careful scheduling. The best overlap window is typically 2–4 hours when both cities are within working hours. Japanese business culture places high value on respect and hierarchy, with typical hours of 9 AM–6 PM. Business hours typically follow a 9 AM–5 PM schedule. 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), while Tokyo stays on JST year-round. When Tehran switches to daylight time, the effective time difference shifts by 1 hour. This typically happens in spring and fall, and the exact dates vary by country. If you have recurring cross-timezone meetings, recalculate the schedule after each DST transition.
JST to IRST — Quick Reference
JST (JST) stands for the timezone used in Tokyo, Japan (UTC+9). IRST (IRST/IRDT) is the timezone used in Tehran, Iran (UTC+3:30). Tokyo is 5 hours and 30 minutes ahead of Tehran.
To convert JST to IRST, subtract 5.5 hours from JST time. For example, JST 9:00 AM = IRST 3:30 AM.
Key Facts
- •Time difference: Tokyo (UTC+9) is 5 hours and 30 minutes ahead of Tehran (UTC+3:30).
- •Daylight Saving Time: Tokyo does not observe DST (JST). Tehran observes DST (IRST/IRDT).
- •Regions: Tokyo is located in Japan and uses the JST time zone. Tehran is located in Iran and uses the IRST/IRDT time zone.
- •Best time to call: The best time to call between Tokyo and Tehran is 3:00 PM to 4:00 PM in Tokyo time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Tokyo and Tehran?
Tokyo is 5 hours and 30 minutes ahead of Tehran.
What time is it in Tehran when it's 9 AM in Tokyo?
When it's 9:00 AM in Tokyo, it is 3:30 AM in Tehran.
What time is 9 PM JST in IRST?
9 PM JST (Tokyo time) is 3:30 PM IRST (Tehran 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 Tokyo and Tehran?
The best time to schedule a meeting is between 3:00 PM to 4:00 PM in Tokyo 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 JST to IRST?
JST (JST) is the timezone for Tokyo, Japan (UTC+9). IRST (IRST/IRDT) is the timezone for Tehran, Iran (UTC+3:30). Tokyo is 5 hours and 30 minutes ahead of Tehran. Quick examples: 9 AM JST = 3:30 AM IRST, 12 PM JST = 6:30 AM IRST, 3 PM JST = 9:30 AM IRST, 6 PM JST = 12:30 PM IRST.
Is Tokyo ahead of or behind Tehran?
Tokyo is 5 hours 30 minutes ahead of Tehran. When it's noon in Tokyo, it's 6:30 AM in Tehran.
Does Tokyo or Tehran change clocks for Daylight Saving Time?
No, Tokyo does not observe DST — it stays on JST year-round. Tehran observes DST and switches between IRST/IRDT. 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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