Time Difference: Tehran vs Washington DC
Tehran
10:07:09 AM IRST
Sunday, April 5, 2026
7h 30m
7h 30m
Washington DC
2:37:09 AM EDT
Sunday, April 5, 2026
Washington DC is 7.5 hours behind Tehran.
Quick Reference
- Tehran
- IRST (GMT+3:30)
No Daylight Saving Time
- Washington DC
- EDT (GMT-4)
EST starts on Nov 1, 2026
Frequently Asked Questions
- What is the time difference between Tehran and Washington DC?
- Washington DC is 7.5 hours behind Tehran.
- When is the best time to call from Tehran to Washington DC?
- 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. Tehran uses IRST and Washington DC uses EDT.