Use this IST to JST time converter to compare India and Japan time instantly. JST is 3 hours and 30 minutes ahead of IST, so 9:00 AM IST becomes 12:30 PM JST and 5:00 PM IST becomes 8:30 PM JST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
Use this IST to JST converter to compare India and Japan time, check the 3 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM IST / 12:30 PM JST.
Converting between India Standard Time and Japan Standard Time means accounting for a 3 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 India Standard Time (UTC +5:30) that you want to convert. Hit "Now" to load the current IST time instantly, or use "+1h" to step forward and compare.
The equivalent Japan Standard Time (UTC +9) time appears immediately. Since JST is 3 hours and 30 minutes ahead of IST, 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 India suggests 9:00 AM IST, that's 12:30 PM JST. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night IST times can land on a different date in JST because of the 3 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 IST (UTC +5:30) 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 IST. Convert the event time to JST so you know exactly when to tune in — with a 3 hours and 30 minutes difference, a morning event in India falls during work hours in Japan.
Quick-reference conversion table covering every hour of the day at a glance.
India Standard Time to Japan Standard Time full day schedule
| India Standard Time | Japan Standard Time |
|---|---|
| 12:00 AM |
3:30 AM
|
| 1:00 AM |
4:30 AM
|
| 2:00 AM |
5:30 AM
|
| 3:00 AM |
6:30 AM
|
| 4:00 AM |
7:30 AM
|
| 5:00 AM |
8:30 AM
|
| 6:00 AM |
9:30 AM
|
| 7:00 AM |
10:30 AM
|
| 8:00 AM |
11:30 AM
|
| 9:00 AM |
12:30 PM
|
| 10:00 AM |
1:30 PM
|
| 11:00 AM |
2:30 PM
|
| 12:00 PM |
3:30 PM
|
| 1:00 PM |
4:30 PM
|
| 2:00 PM |
5:30 PM
|
| 3:00 PM |
6:30 PM
|
| 4:00 PM |
7:30 PM
|
| 5:00 PM |
8:30 PM
|
| 6:00 PM |
9:30 PM
|
| 7:00 PM |
10:30 PM
|
| 8:00 PM |
11:30 PM
|
| 9:00 PM |
12:30 AM
(next day)
|
| 10:00 PM |
1:30 AM
(next day)
|
| 11:00 PM |
2:30 AM
(next day)
|
IST is 3.5 h behind JST. Practical overlap: 12 PM - 5 PM IST = 3:30 - 8:30 PM JST. Growing use case: Japanese OEMs (Toyota, Honda, SoftBank portfolio companies) increasingly coordinate with India engineering teams. Japanese work culture's tolerance of late-evening business calls means 3:30-6 PM JST (12-2:30 PM IST) is a fully usable window both sides.
Indian business hours run 10 AM – 7 PM IST typically; IT / BPO shifts commonly extend to cover US and UK working hours, so 3:30 PM – 12:30 AM IST (US overlap) and 12:30 PM – 9 PM IST (UK overlap) are the two second shifts you see most often. Weekend is Saturday-Sunday for most private-sector employers.
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).
Time gap: JST is 3.5 hours ahead of IST (standard-time offsets — daylight-saving flips shift this by an hour twice a year in most northern-hemisphere zones).
Quick answers about daylight saving time, date changes, business-hour overlap, and the most common scheduling questions between India Standard Time and Japan Standard Time.
Explore more IST 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.
