JST to IST
JST is UTC+9 and IST is UTC+5:30 today — IST is 3½ hours behind JST. Abbreviations are for reading: this page resolves JST to Asia/Tokyo and IST to Asia/Kolkata, which are the names that do not go ambiguous.
IST: India — Irish and Israel Standard Time share the letters.
The working day, side by side
Hours shaded in both rows are inside working hours on both sides. Current abbreviations: JST and IST.
| City | 00:00 in JST | 01:00 in JST | 02:00 in JST | 03:00 in JST | 04:00 in JST | 05:00 in JST | 06:00 in JST | 07:00 in JST | 08:00 in JST | 09:00 in JST | 10:00 in JST | 11:00 in JST | 12:00 in JST | 13:00 in JST | 14:00 in JST | 15:00 in JST | 16:00 in JST | 17:00 in JST | 18:00 in JST | 19:00 in JST | 20:00 in JST | 21:00 in JST | 22:00 in JST | 23:00 in JST |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JST—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| IST—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
- Working hours
- Shoulder
- Night
- Overlap
Do more with JST and IST
Common questions
What is JST in IST?
IST is 3½ hours behind JST today: noon in JST is 08:30 in IST.
Is JST the same all year?
JST refers to the offset used by Asia/Tokyo. Where that zone observes daylight saving, the letters change with it, which is why this site stores the identifier and not the abbreviation.
When can JST and IST meet?
Working hours overlap for 6 hours a day: the shaded overlap is 09:00–15:00 in IST (12:00–18:00 your time).