Time zone converter
IRST to JST
Convert Iran Time — Tehran to Japan Time — Tokyo — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Tehran, it's 2:30 PM in Tokyo. Tokyo is 5½ hours ahead of Tehran. Use the converter above to turn any IRST time into JST, or scan the hour-by-hour table below for the full day.
—
Iran Time — Tehran ·
—
Japan Time — Tokyo ·
Convert a specific timein Tehran → — in Tokyo
IRST to JST at a glance
9:00 AM IRST
2:30 PM
JST · Tokyo
12:00 PM IRST
5:30 PM
JST · Tokyo
5:00 PM IRST
10:30 PM
JST · Tokyo
Planning a meeting between Tehran and Tokyo
Planning a call between Tehran and Tokyo? The best overlap during a standard 9-to-5 workday runs 9:00 AM–11:30 AM IRST (2:30 PM–5:00 PM JST). Aim for that window to reach both sides during business hours.
Hour-by-hour: Tehran to Tokyo
A full day mapped from IRST to JST.
Frequently asked
Is Tokyo ahead of or behind Tehran?
Tokyo is 5½ hours ahead of Tehran.
What is 12:00 PM IRST in JST?
12:00 PM in Tehran is 5:30 PM in Tokyo.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so IRST and JST automatically reflect the correct daylight-saving offset for the current date.