IRST to CST
Convert Iran Time — Tehran to Central Time — Chicago — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Tehran, it's 12:30 AM in Chicago. Chicago is 8½ hours behind Tehran. Use the converter above to turn any IRST time into CST, or scan the hour-by-hour table below for the full day.
IRST to CST at a glance
Planning a meeting between Tehran and Chicago
Tehran and Chicago share no standard 9-to-5 overlap, so a live call usually means one side taking an early-morning or late-evening slot. The hourly table below helps you pick the least-inconvenient time for everyone.
Hour-by-hour: Tehran to Chicago
A full day mapped from IRST to CST.
Frequently asked
Is Chicago ahead of or behind Tehran?
Chicago is 8½ hours behind Tehran.
What is 12:00 PM IRST in CST?
12:00 PM in Tehran is 3:30 AM in Chicago.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so IRST and CST automatically reflect the correct daylight-saving offset for the current date.