IST to JST Time Converter
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.
IST to JST Quick Facts
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.
How to Convert IST to 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.
Why Choose Our IST to JST Converter
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.
IST to JST Time Conversion Chart
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)
|
Timezone offsets and DST rules verified against the IANA Time Zone Database. Conversion math and business-hour overlap windows double-checked against real-world scheduling scenarios.
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IST to JST FAQ
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.
What is the time difference between IST and JST?
When can IST and JST have business-hour overlap?
Does IST or JST observe daylight saving time?
How do I quickly convert IST to JST?
Why JST↔IST?
What's the meeting overlap?
Do either Japan or India observe DST?
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