IRST to JST converter

Iran Time (Tehran) to Japan Time (Tokyo, Osaka).

IRST3:37 AMSat 31 Oct 2026

→

JST9:07 AMSat 31 Oct 2026

JST is 5 h 30 min ahead of IRST.

Pick a time in IRST

⇄ JST to IRST

9:00 AM IRST = 2:30 PM JST same day

Best time to meet

The best time to meet is between 9:00 AM and 12:00 PM IRST, which is 2:30 PM to 5:30 PM JST. Both sides are then inside 9 AM to 5 PM.

IRST to JST time table

For 31 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

IRST	JST
12:00 AM IRST	5:30 AM JST
1:00 AM IRST	6:30 AM JST
2:00 AM IRST	7:30 AM JST
3:00 AM IRST	8:30 AM JST
4:00 AM IRST	9:30 AM JST
5:00 AM IRST	10:30 AM JST
6:00 AM IRST	11:30 AM JST
7:00 AM IRST	12:30 PM JST
8:00 AM IRST	1:30 PM JST
9:00 AM IRST	2:30 PM JST
10:00 AM IRST	3:30 PM JST
11:00 AM IRST	4:30 PM JST
12:00 PM IRST	5:30 PM JST
1:00 PM IRST	6:30 PM JST
2:00 PM IRST	7:30 PM JST
3:00 PM IRST	8:30 PM JST
4:00 PM IRST	9:30 PM JST
5:00 PM IRST	10:30 PM JST
6:00 PM IRST	11:30 PM JST
7:00 PM IRST	12:30 AM JST next day
8:00 PM IRST	1:30 AM JST next day
9:00 PM IRST	2:30 AM JST next day
10:00 PM IRST	3:30 AM JST next day
11:00 PM IRST	4:30 AM JST next day

Quick answers

9:00 AM IRST = 2:30 PM JST
12:00 PM IRST = 5:30 PM JST
3:00 PM IRST = 8:30 PM JST
5:00 PM IRST = 10:30 PM JST
9:00 AM JST = 3:30 AM IRST
12:00 PM JST = 6:30 AM IRST
5:00 PM JST = 11:30 AM IRST

Does the gap change during the year?

No. JST is 5 h 30 min ahead of IRST all year.

IRST does not change its clocks. JST does not change its clocks.

About IRST and JST

IRST here means Iran Time, the clock in Tehran. Right now it is UTC+3:30. It has no daylight saving.

JST here means Japan Time, the clock in Tokyo, Osaka. Right now it is UTC+9. It has no daylight saving.

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