JSTtoISTJapan Standard Time to India Standard Time
JST
Japan Standard Time (GMT+9)IST
India Standard Time (GMT+5:30)Mutual Working Window: 4 Overlapping Hours
Recommended calling window between JST and IST
Both locations share 4 overlapping standard business hours (9:00 AM – 5:00 PM). This is the premier window for real-time video conferences, corporate calls, and instant collaboration without outside-hours disruption.
24-Hour Schedule Conversion Matrix
Compare every hour of the day between JST and IST.
| JST Time (Japan Standard Time) | IST Time (India Standard Time) | Status & Recommendation |
|---|---|---|
| 00:00AM | 20:00PM-1 day | ⚪ Outside Work Hours |
| 01:00AM | 21:00PM-1 day | ⚪ Outside Work Hours |
| 02:00AM | 22:00PM-1 day | ⚪ Outside Work Hours |
| 03:00AM | 23:00PM-1 day | ⚪ Outside Work Hours |
| 04:00AM | 00:00AM | ⚪ Outside Work Hours |
| 05:00AM | 01:00AM | ⚪ Outside Work Hours |
| 06:00AM | 02:00AM | ⚪ Outside Work Hours |
| 07:00AM | 03:00AM | ⚪ Outside Work Hours |
| 08:00AM | 04:00AM | ⚪ Outside Work Hours |
| 09:00AM | 05:00AM | ⚪ Outside Work Hours |
| 10:00AM | 06:00AM | ⚪ Outside Work Hours |
| 11:00AM | 07:00AM | 🟡 Feasible (Shoulder Hour) |
| 12:00PM | 08:00AM | 🟡 Feasible (Shoulder Hour) |
| 13:00PM | 09:00AM | 🟢 Ideal Meeting Window |
| 14:00PM | 10:00AM | 🟢 Ideal Meeting Window |
| 15:00PM | 11:00AM | 🟢 Ideal Meeting Window |
| 16:00PM | 12:00PM | 🟢 Ideal Meeting Window |
| 17:00PM | 13:00PM | ⚪ Outside Work Hours |
| 18:00PM | 14:00PM | ⚪ Outside Work Hours |
| 19:00PM | 15:00PM | ⚪ Outside Work Hours |
| 20:00PM | 16:00PM | ⚪ Outside Work Hours |
| 21:00PM | 17:00PM | ⚪ Outside Work Hours |
| 22:00PM | 18:00PM | ⚪ Outside Work Hours |
| 23:00PM | 19:00PM | ⚪ Outside Work Hours |
Frequently Asked Questions
What is the time difference between JST and IST?
IST is 3 hours 30 minutes behind JST. When it is 12:00 PM (noon) in JST, the current synchronized time in IST is 8:30 AM.
What are the overlapping working hours between JST and IST?
There are 4 overlapping standard business hours (9:00 AM – 5:00 PM) between JST and IST. The optimal scheduling window is 1:00 PM – 5:00 PM in JST (9:00 AM – 1:00 PM in IST).
Does daylight saving time affect the conversion between JST and IST?
No. Neither JST nor IST observes daylight saving time; the offset difference remains constant throughout the year.
What regions and major cities observe JST and IST?
JST (Japan Standard Time) is primarily observed across East Asia (Japan) (key hubs include Tokyo, Osaka, Yokohama, Nagoya). IST (India Standard Time) is observed across South Asia (Republic of India & Sri Lanka) (key hubs include New Delhi, Mumbai, Bengaluru, Hyderabad).
What is 9:00 AM JST in IST?
9:00 AM in JST corresponds to 5:30 AM in IST. You can cross-reference every hour of the day in the 24-hour visual schedule table above.
Which time zone is ahead, JST or IST?
JST is ahead by 3 hours and 30 minutes.