Iran is 6 hours 30 minutes behind Japan. Midday in Iran lines up with 17:00 in Japan.
Iran observes Asia/Tehran and Japan observes Asia/Tokyo — a 5.5 hours 30 minutes gap between them.
Daily overlap window
There is a 2.5-hour window each day where both Iran and Japan are within standard business hours (09:00–17:00).
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Iran
Japan
Overlap (2.5h)
Optimal meeting slots
Iran and Japan share 2.5 hours of business hours overlap daily.
09:00 Tehran / 14:00 Tokyo✓ Both working
10:00 Tehran / 15:00 Tokyo✓ Both working
11:00 Tehran / 16:00 Tokyo✓ Both working
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Upcoming public holidays
Iran
No upcoming public holidays this year.
Japan7 holidays
Jul 20Marine Day
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
How to work with Iran and Japan time zones
Coordinating between Iran (Iran) and Japan (Japan) means working around a 5.5-hour time difference. The 2.5-hour overlap window gives both teams a natural slot for real-time collaboration without anyone working outside normal hours.
💡 How to schedule across these time zones
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Schedule at 09:00–10:00 (Iran) for a 14:00–15:00 slot in Japan — the sweet spot where both teams are working.
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Schedule at 10:00–11:00 (Iran) for a 15:00–16:00 slot in Japan — the sweet spot where both teams are working.
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Schedule at 11:00–12:00 (Iran) for a 16:00–17:00 slot in Japan — the sweet spot where both teams are working.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any Iran time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
