CST to IRST
Convert Central Time — Chicago to Iran Time — Tehran — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Chicago, it's 5:30 PM in Tehran. Tehran is 8½ hours ahead of Chicago. Use the converter above to turn any CST time into IRST, or scan the hour-by-hour table below for the full day.
CST to IRST at a glance
Planning a meeting between Chicago and Tehran
Chicago and Tehran 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: Chicago to Tehran
A full day mapped from CST to IRST.
Frequently asked
Is Tehran ahead of or behind Chicago?
Tehran is 8½ hours ahead of Chicago.
What is 12:00 PM CST in IRST?
12:00 PM in Chicago is 8:30 PM in Tehran.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so CST and IRST automatically reflect the correct daylight-saving offset for the current date.