Daylight saving: local time and fixed CST and IST
The converter starts with Chicago to India, using local clock rules. For the standard-time offsets all year, use the fixed CST and IST button. IST here means India Standard Time, which has no daylight saving.
These examples use noon on the dates shown. A converted date can be the previous or following day.
| Starting date and time | Using local city rules | Using fixed CST and IST |
|---|---|---|
| 2026-01-15 12:00 | 2026-01-15 23:30 (UTC+05:30) | 2026-01-15 23:30 |
| 2026-07-15 12:00 | 2026-07-15 22:30 (UTC+05:30) | 2026-07-15 23:30 |
12:00 PM Wednesday 15 Jul in Chicago is 10:30 PM Wednesday 15 Jul in India (IST, 10 h 30 min ahead).
Why daylight saving conversions need a date explains skipped and repeated clock readings. The rules here come from the browser’s time zone data and can lag a government change.