JST to IRST Time Converter
Use this JST to IRST time converter to compare Japan and Iran time instantly. IRST is 5 hours and 30 minutes behind JST, so 9:00 AM JST becomes 3:30 AM IRST and 5:00 PM JST becomes 11:30 AM IRST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
JST to IRST Quick Facts
Use this JST to IRST converter to compare Japan and Iran time, check the 5 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 3:00 PM JST / 9:30 AM IRST.
How to Convert JST to IRST
Converting between Japan Standard Time and Iran Standard Time means accounting for a 5 hours and 30 minutes gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Japan Standard Time (UTC +9) that you want to convert. Hit "Now" to load the current JST time instantly, or use "+1h" to step forward and compare.
The equivalent Iran Standard Time (UTC +3:30) time appears immediately. Since IRST is 5 hours and 30 minutes behind of JST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the IRST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
Why Choose Our JST to IRST Converter
When someone in Japan suggests 3:00 PM JST, that's 9:30 AM IRST. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night JST times can land on a different date in IRST because of the 5 hours and 30 minutes offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
The half-hour offset between JST (UTC +9) and IRST (UTC +3:30) already makes mental math tricky — add Daylight Saving Time and the gap can shift further. This converter uses live UTC offsets, so you're always accurate.
Product launches, sports matches, and webinars are often announced in JST. Convert the event time to IRST so you know exactly when to tune in — with a 5 hours and 30 minutes difference, a morning event in Japan falls during work hours in Iran.
JST to IRST Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Japan Standard Time to Iran Standard Time full day schedule
| Japan Standard Time | Iran Standard Time |
|---|---|
| 12:00 AM |
6:30 PM
(previous day)
|
| 1:00 AM |
7:30 PM
(previous day)
|
| 2:00 AM |
8:30 PM
(previous day)
|
| 3:00 AM |
9:30 PM
(previous day)
|
| 4:00 AM |
10:30 PM
(previous day)
|
| 5:00 AM |
11:30 PM
(previous day)
|
| 6:00 AM |
12:30 AM
|
| 7:00 AM |
1:30 AM
|
| 8:00 AM |
2:30 AM
|
| 9:00 AM |
3:30 AM
|
| 10:00 AM |
4:30 AM
|
| 11:00 AM |
5:30 AM
|
| 12:00 PM |
6:30 AM
|
| 1:00 PM |
7:30 AM
|
| 2:00 PM |
8:30 AM
|
| 3:00 PM |
9:30 AM
|
| 4:00 PM |
10:30 AM
|
| 5:00 PM |
11:30 AM
|
| 6:00 PM |
12:30 PM
|
| 7:00 PM |
1:30 PM
|
| 8:00 PM |
2:30 PM
|
| 9:00 PM |
3:30 PM
|
| 10:00 PM |
4:30 PM
|
| 11:00 PM |
5:30 PM
|
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