CST to IST Time Converter
Type a time in CST to see it in IST, with daylight saving handled for the date you pick. Every hour of the day is in the table below, and the meeting planner shows when both working days overlap.
In India
8:30 pmIST
9:00 am CST on Wed 14 Jan 2026 is 8:30 pm IST the same day. India is 11 h 30 min ahead of Chicago.
- Date there
- Wednesday 14 January 2026
- Offsets
- CST UTC−6 · IST UTC+5:30
- Date used
- Example day: Wednesday 14 January 2026
How this works: Method, 3 sources,
How this works
Method
Here CST means Central Time, CST (UTC−6) in its winter and CDT (UTC−5) in its summer, as kept in Chicago; IST means India Standard Time, UTC+5:30 all year. So IST is 11 h 30 min ahead of CST and 10 h 30 min ahead of CDT. Two 9-to-5 working days do not overlap at all, so one side has to start early or stay late. Full method
Sources
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Changes
- 15 more conversion pages (IST to CST, BST to IST, SGT, GST, JST, MST and more); each conversion page shows all 24 hours with working hours shaded, and its best meeting times.
- The pickers find about a thousand more cities, states and countries (Seattle, Bangalore, Texas), and each conversion page names the next clock change on either side.
- The converter opens on the time now, live, with a Now choice beside the time, and the main converter starts from your own time zone.
- First published, with a world clock, pages for the time in 31 places and 15 common conversions such as PST to IST.
How to convert CST to IST
Here CST means Central Time, CST (UTC−6) in its winter and CDT (UTC−5) in its summer, as kept in Chicago; IST means India Standard Time, UTC+5:30 all year. So IST is 11 h 30 min ahead of CST and 10 h 30 min ahead of CDT. Two 9-to-5 working days do not overlap at all, so one side has to start early or stay late.
US Central Time covers Chicago, Dallas, Houston, Minneapolis and much of the Midwest and South, home to many manufacturing, energy and healthcare companies with teams in India. A Central morning lands in the Indian late evening, so the practical window for a live call is the early Central morning, before about 10:00 am in Texas or Illinois.
Watch the letters. CST means Central Standard Time (UTC−6) only in winter; from mid-March to early November Chicago is on CDT (UTC−5). And CST is not unique: China Standard Time is also written CST, and it is UTC+8, so an email that just says “10:00 CST” from an Asian supplier may mean something 14 hours away from Chicago. If in doubt, ask for the city or the UTC offset. This page reads CST as US Central and follows Chicago’s clock on the date you choose, the same clock used in Illinois, Missouri, Minnesota and most of Texas.
Rule of thumb: Add 11½ hours to Central time in winter or 10½ hours in summer: 8:00 am in Chicago is 7:30 pm (winter) or 6:30 pm (summer) in India.
IST = CST +11:30 · IST = CDT +10:30
- The tz database notes that abbreviations are ambiguous: “CST means one thing in China and something else in North America”, and recommends numeric offsets such as −0600 instead. Source: IANA tz database, Theory and pragmatics (time zone abbreviations).
Meeting planner: best times for CST and IST
The CST and IST working days never overlap, so every meeting asks one side to start early or stay late. The shaded runs are the hours when both clocks are between 7 am and 9 pm; pick the end that suits whoever has the more flexible day, and swap it now and then.
January: CST and IST
- No hour is inside 9 to 5 on both clocks.
- Early or late for one side: 7:00 am to 9:30 am CST is 6:30 pm to 9:00 pm IST (2 h 30 min); 7:30 pm to 9:00 pm CST is 7:00 am to 8:30 am IST the next day (1 h 30 min).
July: CDT and IST
- No hour is inside 9 to 5 on both clocks.
- Early or late for one side: 7:00 am to 10:30 am CDT is 5:30 pm to 9:00 pm IST (3 h 30 min); 8:30 pm to 9:00 pm CDT is 7:00 am to 7:30 am IST the next day (30 min).
Both between 9 am and 5 pmBoth between 7 am and 9 pm
CST to IST time conversion table
Every hour of the CST day and the time in IST: the January column holds while the clocks are on CST and IST, the July column while they are on CDT and IST. The dates they switch are under the table.
| CST / CDT time | IST in January | IST in July |
|---|---|---|
| 12:00 am | 11:30 am | 10:30 am |
| 1:00 am | 12:30 pm | 11:30 am |
| 2:00 am | 1:30 pm | 12:30 pm |
| 3:00 am | 2:30 pm | 1:30 pm |
| 4:00 am | 3:30 pm | 2:30 pm |
| 5:00 am | 4:30 pm | 3:30 pm |
| 6:00 am | 5:30 pm | 4:30 pm |
| 7:00 am | 6:30 pm | 5:30 pm |
| 8:00 am | 7:30 pm | 6:30 pm |
| 9:00 am | 8:30 pm | 7:30 pm |
| 10:00 am | 9:30 pm | 8:30 pm |
| 11:00 am | 10:30 pm | 9:30 pm |
| 12:00 pm | 11:30 pm | 10:30 pm |
| 1:00 pm | 12:30 am (next day) | 11:30 pm |
| 2:00 pm | 1:30 am (next day) | 12:30 am (next day) |
| 3:00 pm | 2:30 am (next day) | 1:30 am (next day) |
| 4:00 pm | 3:30 am (next day) | 2:30 am (next day) |
| 5:00 pm | 4:30 am (next day) | 3:30 am (next day) |
| 6:00 pm | 5:30 am (next day) | 4:30 am (next day) |
| 7:00 pm | 6:30 am (next day) | 5:30 am (next day) |
| 8:00 pm | 7:30 am (next day) | 6:30 am (next day) |
| 9:00 pm | 8:30 am (next day) | 7:30 am (next day) |
| 10:00 pm | 9:30 am (next day) | 8:30 am (next day) |
| 11:00 pm | 10:30 am (next day) | 9:30 am (next day) |
Shaded: 9 am to 5 pm on that clock. Where a row is shaded on both sides, both are at work.
When the CST–IST difference changes next
| Date | What happens | Then |
|---|---|---|
| Sun 1 Nov 2026 | Chicago falls back (CST) | IST is 11 h 30 min ahead of CST |
| Sun 14 Mar 2027 | Chicago springs forward (CDT) | IST is 10 h 30 min ahead of CDT |
Frequently Asked Questions
What is 9 am CST in IST?
In January, 9:00 am CST is 8:30 pm IST. In July, 9:00 am CDT is 7:30 pm IST.
How many hours is Chicago behind India?
Chicago is 11 h 30 min behind India in winter (CST, UTC−6) and 10 h 30 min behind from mid-March to early November (CDT, UTC−5). Texas, Illinois and the rest of US Central Time follow the same rules.
Is CST China Standard Time or Central Standard Time?
Both use the letters CST. US Central Standard Time is UTC−6 and China Standard Time is UTC+8, 14 hours apart. This page means US Central; for China, see the time in China page.