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Global ClockTime zone converter & meeting planner
PAGES
SETTINGS
Clock
Working hours
Start
09
End
18
Theme

AUTO follows the operating system. Working hours drive the green banding on every grid. All four persist on this device only.

IST to JST

IST is UTC+5:30 and JST is UTC+9 today — JST is 3½ hours ahead of IST. Abbreviations are for reading: this page resolves IST to Asia/Kolkata and JST to Asia/Tokyo, 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: IST and JST.

IST and JST hour by hour, with the working-hour overlap shaded
City00:00 in IST01:00 in IST02:00 in IST03:00 in IST04:00 in IST05:00 in IST06:00 in IST07:00 in IST08:00 in IST09:00 in IST10:00 in IST11:00 in IST12:00 in IST13:00 in IST14:00 in IST15:00 in IST16:00 in IST17:00 in IST18:00 in IST19:00 in IST20:00 in IST21:00 in IST22:00 in IST23:00 in IST
IST——000102030405060708091011121314151617181920212223
JST——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with IST and JST

Open in the PlannerAdd more cities or zones, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep IST, JST and other zones on screen as live clocks, under an animated sky and sun.

Common questions

What is IST in JST?

JST is 3½ hours ahead of IST today: noon in IST is 15:30 in JST.

Is IST the same all year?

India — Irish and Israel Standard Time share the letters. An abbreviation describes an offset at a moment, not a place — the zone identifier Asia/Kolkata is the unambiguous name.

When can IST and JST meet?

Working hours overlap for 5 hours a day: the shaded overlap is 13:00–18:00 in JST (09:00–14:00 your time).

IST converted to other zones