IRST to CST converter

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

IRST3:37 AMSat 31 Oct 2026

→

CST7:07 PMFri 30 Oct 2026

CST is 8 h 30 min behind IRST.

Pick a time in IRST

⇄ CST to IRST

9:00 AM IRST = 12:30 AM CST same day

Best time to meet

No hour falls inside 9 AM to 5 PM in both places. The least painful: around 4:00 PM IRST, which is 7:30 AM CST.

IRST to CST time table

For 31 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

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

Quick answers

9:00 AM IRST = 12:30 AM CST
12:00 PM IRST = 3:30 AM CST
3:00 PM IRST = 6:30 AM CST
5:00 PM IRST = 8:30 AM CST
9:00 AM CST = 5:30 PM IRST
12:00 PM CST = 8:30 PM IRST
5:00 PM CST = 1:30 AM IRST (next day)

Does the gap change during the year?

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

IRST does not change its clocks. 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).

About IRST and CST

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

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.

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