Time Difference: Houston vs Tehran
Houston
8:43:16 AM CST
Friday, November 13, 2026
9h 30m
9h 30m
Tehran
6:13:16 PM IRST
Friday, November 13, 2026
Tehran is 9.5 hours ahead of Houston.
Quick Reference
- Houston
- CST (GMT-6)
CDT starts on Mar 14, 2027
- Tehran
- IRST (GMT+3:30)
No Daylight Saving Time
Frequently Asked Questions
- What is the time difference between Houston and Tehran?
- Tehran is 9.5 hours ahead of Houston.
- When is the best time to call from Houston to Tehran?
- The best time to call is during overlapping business hours (9 AM – 5 PM) in both cities. Use the interactive converter on this page to visually compare hours side by side.
- Does the time difference change with daylight saving time?
- The time difference may change when either city enters or exits daylight saving time. Houston uses CST and Tehran uses IRST.