Convert time from IST to JST. Enter any time to see the equivalent JST time, compare current IST and JST times side by side, and find overlapping business hours for calls and meetings.
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.
1 日の時間ごとに一目でわかる早見換算表。
India Standard Time to Japan Standard Time full day schedule
| India Standard Time | 日本標準時 |
|---|---|
| 午前12時 |
午前3時30分
|
| 午前1時 |
午前4時30分
|
| 午前2時 |
午前5時30分
|
| 午前3時 |
午前6時30分
|
| 午前4時 |
午前7時30分
|
| 午前5時 |
午前8時30分
|
| 午前6時 |
午前9時30分
|
| 午前7時 |
午前10時30分
|
| 午前8時 |
午前11時30分
|
| 午前9時 |
午後12時30分
|
| 午前10時 |
午後1時30分
|
| 午前11時 |
午後2時30分
|
| 午後12時 |
午後3時30分
|
| 午後1時 |
午後4時30分
|
| 午後2時 |
午後5時30分
|
| 午後3時 |
午後6時30分
|
| 午後4時 |
午後7時30分
|
| 午後5時 |
午後8時30分
|
| 午後6時 |
午後9時30分
|
| 午後7時 |
午後10時30分
|
| 午後8時 |
午後11時30分
|
| 午後9時 |
午前12時30分
(翌日)
|
| 午後10時 |
午前1時30分
(翌日)
|
| 午後11時 |
午前2時30分
(翌日)
|
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.
日本 — DST を導入していない数少ない大経済国の 1 つであるため、JST は一年中 JST (UTC+9) です。営業時間は日本時間で午前 9 時から午後 6 時までで、プレゼンスベースの文化が根付いています (午後 7 時を過ぎることもよくあります)。韓国標準時 (KST) と同じオフセット。
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).
Explore more ist conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
主要ゾーンと日本標準時との時差を求めます。別の地域から日本とのスケジュールを設定する場合は、これらのページを使用してください。
