CST to IRST converter

Central Time (Chicago, Dallas, Houston, Winnipeg) to Iran Time (Tehran).

CST7:07 PMFri 30 Oct 2026

→

IRST3:37 AMSat 31 Oct 2026

IRST is 8 h 30 min ahead of CST.

Pick a time in CST

⇄ IRST to CST

9:00 AM CST = 5:30 PM IRST same day

Best time to meet

No hour falls inside 9 AM to 5 PM in both places. The least painful: around 7:00 AM CST, which is 3:30 PM IRST.

CST to IRST time table

For 30 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

CST	IRST
12:00 AM CST	8:30 AM IRST
1:00 AM CST	9:30 AM IRST
2:00 AM CST	10:30 AM IRST
3:00 AM CST	11:30 AM IRST
4:00 AM CST	12:30 PM IRST
5:00 AM CST	1:30 PM IRST
6:00 AM CST	2:30 PM IRST
7:00 AM CST	3:30 PM IRST
8:00 AM CST	4:30 PM IRST
9:00 AM CST	5:30 PM IRST
10:00 AM CST	6:30 PM IRST
11:00 AM CST	7:30 PM IRST
12:00 PM CST	8:30 PM IRST
1:00 PM CST	9:30 PM IRST
2:00 PM CST	10:30 PM IRST
3:00 PM CST	11:30 PM IRST
4:00 PM CST	12:30 AM IRST next day
5:00 PM CST	1:30 AM IRST next day
6:00 PM CST	2:30 AM IRST next day
7:00 PM CST	3:30 AM IRST next day
8:00 PM CST	4:30 AM IRST next day
9:00 PM CST	5:30 AM IRST next day
10:00 PM CST	6:30 AM IRST next day
11:00 PM CST	7:30 AM IRST next day

Quick answers

9:00 AM CST = 5:30 PM IRST
12:00 PM CST = 8:30 PM IRST
3:00 PM CST = 11:30 PM IRST
5:00 PM CST = 1:30 AM IRST (next day)
9:00 AM IRST = 12:30 AM CST
12:00 PM IRST = 3:30 AM CST
5:00 PM IRST = 8:30 AM CST

Does the gap change during the year?

Yes, because of daylight saving. Until 1 Nov 2026: IRST is 8 h 30 min ahead of CST. From 1 Nov 2026 to 14 Mar 2027: IRST is 9 h 30 min ahead of CST. From 14 Mar 2027 to 7 Nov 2027: IRST is 8 h 30 min ahead of CST.

CST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−6), then on 14 Mar 2027 (forward 1 h, to UTC−5). IRST does not change its clocks.

About CST and IRST

CST here means Central Time, the clock in Chicago, Dallas, Houston, Winnipeg. Right now it is UTC−5. Strictly, CST is the winter name; in summer these places use CDT. This page follows their real clock all year.

IRST here means Iran Time, the clock in Tehran. Right now it is UTC+3:30. It has no daylight saving.

Every city on your wrist

Meanwhile puts these times in your Mac menu bar, on your iPhone home screen and on your Apple Watch. Type “3pm Tokyo” and every city answers. Free for 3 cities. Unlock every city on every device once for $4.99, shared with your family. No subscription.

Coming soon