Time Difference: London vs Tehran
Tehran is 2.5 hours ahead of London.
Quick Reference
- London
- BST (GMT+1)
GMT starts on Oct 25, 2026
- Tehran
- IRST (GMT+3:30)
No Daylight Saving Time
Frequently Asked Questions
- What is the time difference between London and Tehran?
- Tehran is 2.5 hours ahead of London.
- When is the best time to call from London 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. London uses BST and Tehran uses IRST.