Time Difference

Chicago vs Tehran Time Difference

Compare the current local time in Chicago, United States and Tehran, Iran.

Live local timeDST awareUTC offsets

From

Chicago

United States

6:27 PM

Sun, Aug 16

UTC-5America/Chicago

Difference

8h 30m

Swap

Tehran

Iran

2:57 AM

Mon, Aug 17

UTC+3:30Asia/Tehran

Current difference

Tehran is currently 8 hours 30 minutes ahead of Chicago.

This difference is calculated using the current UTC offsets for both locations and automatically reflects daylight-saving changes.

24-hour comparison

Compare Chicago and Tehran hour by hour

See how a full local day in Chicago, United States maps to Tehran, Iran. TimeInOne automatically accounts for timezone offsets, date changes and daylight-saving transitions.

24-hour day

Best working-hours overlap

9:00 AM – 10:00 AM in Chicago

corresponds to 5:30 PM – 6:30 PM in Tehran.

1 hour overlap

Chicago

America/Chicago

Tehran

Asia/Tehran

Availability

12:00 AM

Sun, Aug 16

8:30 AM

Sun, Aug 16

Night

1:00 AM

Sun, Aug 16

9:30 AM

Sun, Aug 16

Night

2:00 AM

Sun, Aug 16

10:30 AM

Sun, Aug 16

Night

3:00 AM

Sun, Aug 16

11:30 AM

Sun, Aug 16

Night

4:00 AM

Sun, Aug 16

12:30 PM

Sun, Aug 16

Night

5:00 AM

Sun, Aug 16

1:30 PM

Sun, Aug 16

Night

6:00 AM

Sun, Aug 16

2:30 PM

Sun, Aug 16

Night

7:00 AM

Sun, Aug 16

3:30 PM

Sun, Aug 16

Possible

8:00 AM

Sun, Aug 16

4:30 PM

Sun, Aug 16

Possible

9:00 AM

Sun, Aug 16

5:30 PM

Sun, Aug 16

Good overlap

10:00 AM

Sun, Aug 16

6:30 PM

Sun, Aug 16

Possible

11:00 AM

Sun, Aug 16

7:30 PM

Sun, Aug 16

Possible

12:00 PM

Sun, Aug 16

8:30 PM

Sun, Aug 16

Possible

1:00 PM

Sun, Aug 16

9:30 PM

Sun, Aug 16

Night

2:00 PM

Sun, Aug 16

10:30 PM

Sun, Aug 16

Night

3:00 PM

Sun, Aug 16

11:30 PM

Sun, Aug 16

Night

4:00 PM

Sun, Aug 16

12:30 AM

Next day

Mon, Aug 17

Night

5:00 PM

Sun, Aug 16

1:30 AM

Next day

Mon, Aug 17

Night

6:00 PM

Sun, Aug 16

2:30 AM

Next day

Mon, Aug 17

Night

7:00 PM

Sun, Aug 16

3:30 AM

Next day

Mon, Aug 17

Night

8:00 PM

Sun, Aug 16

4:30 AM

Next day

Mon, Aug 17

Night

9:00 PM

Sun, Aug 16

5:30 AM

Next day

Mon, Aug 17

Night

10:00 PM

Sun, Aug 16

6:30 AM

Next day

Mon, Aug 17

Night

11:00 PM

Sun, Aug 16

7:30 AM

Next day

Mon, Aug 17

Night

Working-hour labels use a general 9:00 AM–6:00 PM schedule. Individual schedules may differ.

On daylight-saving transition dates, a local day can contain 23 or 25 real hours instead of 24.

Call planning

Best time to call Tehran from Chicago

Compare typical business hours in Chicago, United States and Tehran, Iran to find a practical time for calls, meetings or international coordination.

Chicago

9:00 AM – 10:00 AM

United States

Best overlap

Tehran

5:30 PM – 6:30 PM

Iran

The best time to call Tehran from Chicago is between 9:00 AM and 10:00 AM in Chicago. This corresponds to 5:30 PM – 6:30 PM in Tehran.

Other reasonable windows

Chicago

7:00 AM – 9:00 AM

Tehran

3:30 PM – 5:30 PM

Chicago

10:00 AM – 1:00 PM

Tehran

6:30 PM – 9:30 PM

Recommendations use typical 9:00 AM–6:00 PM business hours and a broader 7:00 AM–9:00 PM acceptable calling window. Individual schedules may differ.

Time difference explained

Chicago and Tehran time difference explained

Current local-time relationship

Tehran is currently 8 hours and 30 minutes ahead of Chicago.

Chicago uses America/Chicago and currently has an offset of UTC-5. Tehran uses Asia/Tehran and currently has an offset of UTC+3:30.

Working-hours overlap

For a typical 9:00 AM–6:00 PM workday, the cities overlap from 9:00 AM to 9:30 AM in Chicago, corresponding to 5:30 PM–6:00 PM in Tehran.

Because UTC offsets can change during the year, always check the selected date when planning an important international call or meeting.

Convert a specific time

Need more than the current difference?

Convert a specific date and local time between Chicago and Tehran.

Open time converter

Local clocks

Explore each city

Current time in Chicago Current time in Tehran

FAQ

Chicago to Tehran time difference FAQ

Common questions about the current time difference, UTC offsets, daylight-saving changes and practical calling hours between Chicago and Tehran.

What is the time difference between Chicago and Tehran?

The current time difference between Chicago and Tehran is 8h 30m. Tehran is currently 8 hours and 30 minutes ahead of Chicago.

Is Tehran ahead of or behind Chicago?

Tehran is currently 8 hours and 30 minutes ahead of Chicago.

What time is it in Tehran when it is 9:00 AM in Chicago?

Using the current UTC offsets, 9:00 AM in Chicago corresponds to 5:30 PM in Tehran. The exact difference can change when daylight-saving rules change.

What is the best time to call Tehran from Chicago?

Typical 9:00 AM–6:00 PM business hours overlap between 9:00 AM and 9:30 AM in Chicago. This corresponds to 5:30 PM–6:00 PM in Tehran.

Can the time difference between Chicago and Tehran change?

Yes. The time difference can change if Chicago or Tehran changes its UTC offset because of daylight-saving or other local time-zone rules. TimeInOne uses the IANA zones America/Chicago and Asia/Tehran for date-aware calculations.