Convert time from JST to IRST. Enter any time to see the equivalent IRST time, compare current JST and IRST times side by side, and find overlapping business hours for calls and meetings.
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.
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.
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.
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
|
Japan — one of the few large economies that has no DST, so JST is JST year-round (UTC+9). Business hours 9 AM – 6 PM JST with strong presence-based culture (staying past 7 PM is common). Same offset as Korean Standard Time (KST).
Explore more jst conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Find the time difference from any major zone into Iran Standard Time. Use these pages when scheduling with Iran from a different region.
