How many hours is IST ahead of CLT?
As abbreviations, CLT is always 9.5 hours behind of IST: IST is UTC+5:30 and CLT is UTC−4. To convert, subtract 9.5 hours.
Check which label you actually need: CLT (Chile Time is on UTC−3 today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now CLT is 8.5 hours behind of IST.
When the IST to CLT time difference changes
For most of the year CLT is 8.5 hours behind of IST. From 4 April to 4 September 2027, CLT is 9.5 hours behind of IST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
| Dates | CLT vs IST | Length |
|---|---|---|
| 6 September 2026 to 31 December 2026 | 8.5 hours behind | 117 days |
| 1 January 2027 to 3 April 2027 | 8.5 hours behind | 93 days |
| 4 April 2027 to 4 September 2027 | 9.5 hours behind | 154 days |
| 5 September 2027 to 31 December 2027 | 8.5 hours behind | 118 days |
Best time for a meeting between IST and CLT
- When CLT is 8.5 hours behind of IST: no shared 09:00 to 17:00 hours; try 17:00 in IST (08:30 in CLT).
- When CLT is 9.5 hours behind of IST: no shared 09:00 to 17:00 hours; try 17:00 in IST (07:30 in CLT).