Time zone converter
JST to IRST
Convert Japan Time — Tokyo to Iran Time — Tehran — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Tokyo, it's 3:30 AM in Tehran. Tehran is 5½ hours behind Tokyo. Use the converter above to turn any JST time into IRST, or scan the hour-by-hour table below for the full day.
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Japan Time — Tokyo ·
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Iran Time — Tehran ·
Convert a specific timein Tokyo → — in Tehran
JST to IRST at a glance
9:00 AM JST
3:30 AM
IRST · Tehran
12:00 PM JST
6:30 AM
IRST · Tehran
5:00 PM JST
11:30 AM
IRST · Tehran
Planning a meeting between Tokyo and Tehran
Planning a call between Tokyo and Tehran? The best overlap during a standard 9-to-5 workday runs 2:30 PM–5:00 PM JST (9:00 AM–11:30 AM IRST). Aim for that window to reach both sides during business hours.
Hour-by-hour: Tokyo to Tehran
A full day mapped from JST to IRST.
Frequently asked
Is Tehran ahead of or behind Tokyo?
Tehran is 5½ hours behind Tokyo.
What is 12:00 PM JST in IRST?
12:00 PM in Tokyo is 6:30 AM in Tehran.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so JST and IRST automatically reflect the correct daylight-saving offset for the current date.