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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 CST

IST is UTC+5:30 and CST is UTC−5 today — CST is 10½ hours behind IST. Abbreviations are for reading: this page resolves IST to Asia/Kolkata and CST to America/Chicago, which are the names that do not go ambiguous.

IST: India — Irish and Israel Standard Time share the letters. CST: US Central — China Standard Time also uses these letters.

The working day, side by side

The working days do not meet at all. Current abbreviations: IST and CDT.

IST and CST 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
CST——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with IST and CST

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, CST and other zones on screen as live clocks, under an animated sky and sun.

Common questions

What is IST in CST?

CST is 10½ hours behind IST today: noon in IST is 01:30 in CST.

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 CST meet?

They do not overlap during working hours. 17:00–18:00 your time (07:00 there) is the cheapest compromise.

IST converted to other zones