IST to CST Time Zone Converter
India Standard Time to US Central Time lines up India's clock with Chicago, Dallas, and Houston — and it lands you on the previous day. Central is 11 hours 30 minutes behind India in winter and 10 hours 30 minutes behind in summer, because the US shifts to daylight time while India never changes. Morning in India is the night before in the American Midwest.
Enter a date and time to convert.
Daylight saving is applied automatically for the date you pick. Labels like PST/EST name the zone (Pacific/Eastern); the real abbreviation shifts to PDT/EDT during daylight saving, and gmt here means London (GMT in winter, BST in summer) while utc stays fixed.
The time difference
US Central Time is 11 hours 30 minutes behind India in winter and 10 hours 30 minutes behind in summer. India (Kolkata, Mumbai, Delhi, Bangalore) never leaves UTC+5:30, but the US Central zone springs forward on Mar 8, 2026 and falls back on Nov 1, 2026. Because only the US side moves, the gap shrinks by an hour over the summer.
A worked example
Take 9:00 AM in India. On Jan 15, 2026 that is 9:30 PM the night before — Wed, Jan 14 — in Chicago. On Jul 15, 2026 it's 10:30 PM on Tue, Jul 14. Watch the day: an India morning lands on the previous calendar date in the Midwest. That day flip is the easy mistake to make when booking an India-US call, so lock in the date, not just the hour.
Daylight saving & the abbreviation caveat
"CST" is the winter label. From spring to fall the Central zone runs on CDT (Central Daylight Time), an hour ahead, and locals just say "Central" or "CT" year-round. India never observes daylight saving — it stays at UTC+5:30 always — so every shift is on the US side. The converter picks the right Central offset for your exact date, which is why the summer answer differs by an hour.
When you'll use it
Scheduling a call between an India team and a Chicago or Dallas office, timing a US live event, joining a Midwest market open, or setting overlap hours for remote work — always confirming which calendar day the US side falls on.
Frequently asked questions
How far behind IST is Central Time?
11 hours 30 minutes in winter (CST) and 10 hours 30 minutes in summer (CDT). India holds steady while the US Central zone springs forward, so the gap narrows by an hour from spring to fall.
Why does a morning in India fall on the previous day in Chicago?
With an 11-plus-hour gap, subtracting from an India morning takes you past midnight into the prior evening in the Midwest. It catches people out on India-US calls, so always check the date as well as the time.
Is CST the same as Chicago time?
In winter, yes. From spring to fall Chicago runs on CDT (Central Daylight Time), one hour ahead; locals just say 'Central' or 'CT' either way.