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Time difference between Chicago and Tehran

Tehran is 8 hours 30 minutes ahead of Chicago. When it's 9:00 in Chicago, it's 17:30 in Tehran.

Tehran is 8 hours 30 minutes ahead of Chicago.

On Monday, 5 October 2026, 09:00 in Chicago is 17:30 in Tehran. Chicago is UTC−5; Tehran is UTC+3:30.

The gap through 2026

  1. 1 Jan – 8 MarTehran is 9 hours 30 minutes ahead of Chicago.
  2. 8 Mar – 1 NovTehran is 8 hours 30 minutes ahead of Chicago.
  3. 1 Nov – 31 DecTehran is 9 hours 30 minutes ahead of Chicago.
  • Chicago moves its clocks forward on 8 March (UTC−6 → UTC−5).
  • Chicago moves its clocks back on 1 November (UTC−5 → UTC−6).

Chicago to Tehran, hour by hour

On Monday 5 October.

ChicagoTehran
07:00 Early morning15:30 Working hours
08:00 Early morning16:30 Working hours
09:00 Working hours17:30 Evening
10:00 Working hours18:30 Evening
11:00 Working hours19:30 Evening
12:00 Working hours20:30 Evening
13:00 Working hours21:30 Evening
14:00 Working hours22:30 Sleeping hours
15:00 Working hours23:30 Sleeping hours
16:00 Working hours00:30+1 Sleeping hours
17:00 Evening01:30+1 Sleeping hours
18:00 Evening02:30+1 Sleeping hours
19:00 Evening03:30+1 Sleeping hours
20:00 Evening04:30+1 Sleeping hours
21:00 Evening05:30+1 Sleeping hours
22:00 Sleeping hours06:30+1 Sleeping hours

Daylight saving in 2026

  • Chicago moves its clocks forward on Sunday 8 March (UTC−6 → UTC−5).
  • Chicago moves its clocks back on Sunday 1 November (UTC−5 → UTC−6).
  1. 1 Jan – 8 MarTehran is 9 hours 30 minutes ahead of Chicago.
  2. 8 Mar – 1 NovTehran is 8 hours 30 minutes ahead of Chicago.
  3. 1 Nov – 31 DecTehran is 9 hours 30 minutes ahead of Chicago.

Best times for a call

Working hours (09:00–17:00) in Chicago and Tehran don't overlap, so any call is early or late for someone.

  • Chicago 07:00Early morningTehran 15:30Working hours
  • Chicago 09:00Working hoursTehran 17:30Evening
  • Chicago 10:00Working hoursTehran 18:30Evening

More time differences for Chicago and Tehran

How the time difference calculator works

The difference is each city's offset from UTC on the date you pick, subtracted. Offsets come from the IANA time zone database in your browser.

Because countries change their clocks on different dates — or not at all — the gap between two cities can change for a few weeks a year. The calculator lists every change in the year.

Examples

  • London is 5 hours ahead of New York for most of the year, but only 4 hours ahead for about three weeks in March and one week in late October.
  • Dubai doesn't change its clocks, so its gap to London is 4 hours in winter and 3 hours in summer.

Good for

  • Knowing when a colleague's day starts
  • Setting expectations for replies across time zones
  • Planning travel and jet lag

Frequently asked questions

What time is it in Tehran when it's 9 AM in Chicago?
5:30 PM — as of 5 October 2026. Tehran is 8 hours 30 minutes ahead of Chicago.
Does the time difference between Chicago and Tehran change?
Yes. In 2026 it's 9 hours 30 minutes or 8 hours 30 minutes, depending on the date, because only Chicago changes its clocks.
What's the best time for a call between Chicago and Tehran?
There's no hour when both cities are in working hours (09:00–17:00). The fairest is around 07:00 in Chicago (15:30 in Tehran).
What time zones are Chicago and Tehran in?
Chicago uses America/Chicago (UTC−5 today); Tehran uses Asia/Tehran (UTC+3:30 today).

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