Does Tehran observe daylight saving time?

No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.

Does Tokyo observe daylight saving time?

No. Tokyo stays on JST (UTC+9) all year, so its clocks don't change.

What time is it in Tokyo when it's 9 AM in Tehran?

2:30 PM in Tokyo, on the same day.

Tehran to Tokyo Meeting Planner

Tokyo is 5 hours 30 minutes ahead of Tehran right now. Their working days overlap for 2 hours 30 minutes today.

Tehran · Iran

5:08 AM

Sun, Oct 18 · IRST

Tokyo · Japan

10:38 AM

Sun, Oct 18 · JST

Best Meeting Times Between Tehran and Tokyo

9:00 AM to 11:30 AM in Tehran (2:30 PM to 5:00 PM in Tokyo). That's when both cities are inside working hours, 9 AM to 5 PM, giving 2 hours 30 minutes of overlap today.

Who's meeting

2 of 4 places

TehranOrganizerIran ·5:08AMnow
TokyoJapan ·10:38AMnow

Add a city

Add up to 4 places by city, country, time zone or abbreviation, like Tokyo, India or JST. Press "/" to jump here.

Date in Tehran

Working hours, everywhere

Best times to meet

Sunday, October 18, 2026, in Tehran time.

11:00AMBest · OptimalWorking hours in Tehran (11:00) and Tokyo (16:30).
10:30AMOption 2 · OptimalWorking hours in Tehran (10:30) and Tokyo (16:00).
10:00AMOption 3 · OptimalWorking hours in Tehran (10:00) and Tokyo (15:30).

The whole day

Pick any slot in the Fit row, or use the arrow keys there, to make it the meeting time.

Each column is a half hour of the first place's day. The Fit row grades how well the slot suits everyone; each row shows the local time and whether it's working hours there.
Fit
TehranUTC+3:30
TokyoUTC+9
UTC	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20

Working hours (09–17)Just outside (07–09, 17–20)Late evening (20–23)NightFit: optimal, good, possible, poor

Your meeting

Tehran11:00 AM UTC+3:30Sun, Oct 18
Tokyo4:30 PM UTC+9Sun, Oct 18
UTC2026-10-18 07:30 UTC

What will it cost? Try the meeting cost calculator.

Time difference between Tehran and Tokyo

Tokyo is 5 hours 30 minutes ahead of Tehran right now: Tokyo is on JST (UTC+9) and Tehran on IRST (UTC+3:30). Neither city changes its clocks, so the gap is the same all year.

Time difference between Tehran and Tokyo over the next 12 months
From	Difference	Why
Now	Tokyo 5 hours 30 minutes ahead	—

Tehran is on Iran Standard Time. Tokyo is on Japan Standard Time.

Frequently Asked Questions: Tehran & Tokyo Scheduling

What is the time difference between Tehran and Tokyo?: Tokyo is 5 hours 30 minutes ahead of Tehran right now: Tokyo is on JST (UTC+9) and Tehran on IRST (UTC+3:30). Neither city changes its clocks, so the gap is the same all year.
What is the best time to schedule a meeting between Tehran and Tokyo?: 9:00 AM to 11:30 AM in Tehran (2:30 PM to 5:00 PM in Tokyo). That's when both cities are inside working hours, 9 AM to 5 PM, giving 2 hours 30 minutes of overlap today.
Does Tehran observe daylight saving time?: No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.
Does Tokyo observe daylight saving time?: No. Tokyo stays on JST (UTC+9) all year, so its clocks don't change.
What time is it in Tokyo when it's 9 AM in Tehran?: 2:30 PM in Tokyo, on the same day.

Or see every city pair, or plan with more places in the meeting planner.