Convert time from IRST to JST. Enter any time to see the equivalent JST time, compare current IRST and JST times side by side, and find overlapping business hours for calls and meetings.
Use this IRST to JST converter to compare Iran and Japan time, check the 5 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM IRST / 2:30 PM JST.
Converting between Iran Standard Time and Japan 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 Iran Standard Time (UTC +3:30) that you want to convert. Hit "Now" to load the current irst time instantly, or use "+1h" to step forward and compare.
The equivalent Japan Standard Time (UTC +9) time appears immediately. Since jst is 5 hours and 30 minutes ahead of irst, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the jst 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 Iran suggests 9:00 AM irst, that's 2:30 PM jst. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night irst times can land on a different date in jst 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 irst (UTC +3:30) and jst (UTC +9) 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 irst. Convert the event time to jst so you know exactly when to tune in — with a 5 hours and 30 minutes difference, a morning event in Iran falls during work hours in Japan.
Quick-reference conversion table covering every hour of the day at a glance.
Iran Standard Time to Japan Standard Time full day schedule
| Iran Standard Time | Japan Standard Time |
|---|---|
| 12:00 AM |
5:30 AM
|
| 1:00 AM |
6:30 AM
|
| 2:00 AM |
7:30 AM
|
| 3:00 AM |
8:30 AM
|
| 4:00 AM |
9:30 AM
|
| 5:00 AM |
10:30 AM
|
| 6:00 AM |
11:30 AM
|
| 7:00 AM |
12:30 PM
|
| 8:00 AM |
1:30 PM
|
| 9:00 AM |
2:30 PM
|
| 10:00 AM |
3:30 PM
|
| 11:00 AM |
4:30 PM
|
| 12:00 PM |
5:30 PM
|
| 1:00 PM |
6:30 PM
|
| 2:00 PM |
7:30 PM
|
| 3:00 PM |
8:30 PM
|
| 4:00 PM |
9:30 PM
|
| 5:00 PM |
10:30 PM
|
| 6:00 PM |
11:30 PM
|
| 7:00 PM |
12:30 AM
(next day)
|
| 8:00 PM |
1:30 AM
(next day)
|
| 9:00 PM |
2:30 AM
(next day)
|
| 10:00 PM |
3:30 AM
(next day)
|
| 11:00 PM |
4:30 AM
(next day)
|
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 irst 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 Japan Standard Time. Use these pages when scheduling with Japan from a different region.
