The time difference between Tehran and Chicago is 8 hours and 30 minutes. When it is 12:00 noon in Tehran, it is 03:30 in Chicago. Tehran uses the Asia/Tehran time zone (UTC+3:30), while Chicago uses America/Chicago (UTC-5).
With a 8 hours and 30 minutes gap, there is no standard business-hours overlap between Tehran and Chicago. One party will need to adjust their schedule. Early mornings in Tehran or late evenings in Chicago tend to be the most practical compromise.
Use this table to quickly convert any hour from Tehran time to Chicago time. Rows highlighted in green indicate overlapping business hours in both cities.
| Tehran | Chicago | |
|---|---|---|
| 00:00 | 15:30 (-1 day) | Night |
| 01:00 | 16:30 (-1 day) | Night |
| 02:00 | 17:30 (-1 day) | Night |
| 03:00 | 18:30 (-1 day) | Night |
| 04:00 | 19:30 (-1 day) | Night |
| 05:00 | 20:30 (-1 day) | Night |
| 06:00 | 21:30 (-1 day) | |
| 07:00 | 22:30 (-1 day) | |
| 08:00 | 23:30 (-1 day) | |
| 09:00 | 00:30 | |
| 10:00 | 01:30 | |
| 11:00 | 02:30 | |
| 12:00 | 03:30 | |
| 13:00 | 04:30 | |
| 14:00 | 05:30 | |
| 15:00 | 06:30 | |
| 16:00 | 07:30 | |
| 17:00 | 08:30 | |
| 18:00 | 09:30 | |
| 19:00 | 10:30 | |
| 20:00 | 11:30 | |
| 21:00 | 12:30 | |
| 22:00 | 13:30 | Night |
| 23:00 | 14:30 | Night |
Chicago is currently observing daylight saving time, while Tehran is on standard time. When Chicago switches back to standard time, the difference between these two cities will shift by 1 hour.
The time difference is 8 hours and 30 minutes. Chicago is 8 hours and 30 minutes behind Tehran.
Yes. One of these cities observes DST while the other does not, so the difference shifts by 1 hour when DST begins or ends.
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Subtract 8 hours and 30 minutes from Tehran time to get Chicago time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.