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IST to CST
Central Time is 11 hours 30 min behind India Standard Time in January, when the clocks read IST (UTC+5:30) and CST (UTC−6), and 10 hours 30 min behind in July, when they read IST (UTC+5:30) and CDT (UTC−5).
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IST to CST, hour by hour
Each hour of the day in India Standard Time, and the time in Central Time at that moment.
| IST | CST / CDT, January | CST / CDT, July |
|---|---|---|
| 12:00 am | 12:30 pm (day before) | 1:30 pm (day before) |
| 1:00 am | 1:30 pm (day before) | 2:30 pm (day before) |
| 2:00 am | 2:30 pm (day before) | 3:30 pm (day before) |
| 3:00 am | 3:30 pm (day before) | 4:30 pm (day before) |
| 4:00 am | 4:30 pm (day before) | 5:30 pm (day before) |
| 5:00 am | 5:30 pm (day before) | 6:30 pm (day before) |
| 6:00 am | 6:30 pm (day before) | 7:30 pm (day before) |
| 7:00 am | 7:30 pm (day before) | 8:30 pm (day before) |
| 8:00 am | 8:30 pm (day before) | 9:30 pm (day before) |
| 9:00 am | 9:30 pm (day before) | 10:30 pm (day before) |
| 10:00 am | 10:30 pm (day before) | 11:30 pm (day before) |
| 11:00 am | 11:30 pm (day before) | 12:30 am |
| 12:00 pm | 12:30 am | 1:30 am |
| 1:00 pm | 1:30 am | 2:30 am |
| 2:00 pm | 2:30 am | 3:30 am |
| 3:00 pm | 3:30 am | 4:30 am |
| 4:00 pm | 4:30 am | 5:30 am |
| 5:00 pm | 5:30 am | 6:30 am |
| 6:00 pm | 6:30 am | 7:30 am |
| 7:00 pm | 7:30 am | 8:30 am |
| 8:00 pm | 8:30 am | 9:30 am |
| 9:00 pm | 9:30 am | 10:30 am |
| 10:00 pm | 10:30 am | 11:30 am |
| 11:00 pm | 11:30 am | 12:30 pm |
When the gap changes in 2026 and 2027
| From | To | Difference |
|---|---|---|
| Thu 1 Jan 2026 | Sat 7 Mar 2026 | Central Time is 11 hours 30 min behind India Standard Time |
| Sun 8 Mar 2026 | Sat 31 Oct 2026 | Central Time is 10 hours 30 min behind India Standard Time |
| Sun 1 Nov 2026 | Sat 13 Mar 2027 | Central Time is 11 hours 30 min behind India Standard Time |
| Sun 14 Mar 2027 | Sat 6 Nov 2027 | Central Time is 10 hours 30 min behind India Standard Time |
| Sun 7 Nov 2027 | and after | Central Time is 11 hours 30 min behind India Standard Time |
Working hours overlap
When 9 am – 5 pm on both sides meet, in each side's own time.
| January | July | |
|---|---|---|
| India Standard Time | No overlap | No overlap |
| Central Time | No overlap | No overlap |
About these abbreviations
- IST: India Standard Time, UTC+5:30 all year. Ireland and Israel also use the letters IST for their own zones.
- CST: US Central Time (Chicago), CDT in summer. China Standard Time is also written CST; that is a different zone, UTC+8.
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