Offset
The time difference between Washington and Tehran is 7.5 hours.
Washington (EDT) is behind Tehran (IRST).
EDT: UTC-4
IRST: UTC+3:30
Washington is currently observing daylight saving time; Tehran is not.
When to schedule
Business-hours overlap: 9 AM–10 AM in Washington (4 PM–5 PM in Tehran).
Both teams are in working hours during this window on weekdays.
Suggested time: 9:00 AM Washington (4:30 PM Tehran).
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
About these zones
Washington uses Eastern Time (EST, or EDT). To call United States, dial +1.
Tehran uses Iran Standard Time (IRST). To call Iran, dial +98.
Tehran is approximately 6,300 miles northeast of Washington.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Washington | Tehran | Day |
|---|---|---|
| 12:00 am | 7:30 am | Same day |
| 1:00 am | 8:30 am | Same day |
| 2:00 am | 9:30 am | Same day |
| 3:00 am | 10:30 am | Same day |
| 4:00 am | 11:30 am | Same day |
| 5:00 am | 12:30 pm | Same day |
| 6:00 am | 1:30 pm | Same day |
| 7:00 am | 2:30 pm | Same day |
| 8:00 am | 3:30 pm | Same day |
| 9:00 am | 4:30 pm | Same day |
| 10:00 am | 5:30 pm | Same day |
| 11:00 am | 6:30 pm | Same day |
| 12:00 pm | 7:30 pm | Same day |
| 1:00 pm | 8:30 pm | Same day |
| 2:00 pm | 9:30 pm | Same day |
| 3:00 pm | 10:30 pm | Same day |
| 4:00 pm | 11:30 pm | Same day |
| 5:00 pm | 12:30 am | +1 day |
| 6:00 pm | 1:30 am | +1 day |
| 7:00 pm | 2:30 am | +1 day |
| 8:00 pm | 3:30 am | +1 day |
| 9:00 pm | 4:30 am | +1 day |
| 10:00 pm | 5:30 am | +1 day |
| 11:00 pm | 6:30 am | +1 day |
Daylight saving time
Washington observes daylight saving time; Tehran does not. The offset between the two zones changes when Washington transitions: on Sunday, November 1, 2026, clocks fall back from EDT to EST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:44 AM
- Sunset
- 8:32 PM
- Day length
- 14h 48m
- Sunrise
- 4:49 AM
- Sunset
- 7:19 PM
- Day length
- 14h 30m
Cities in these zones
Other cities in Eastern Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Eastern Time
- EWR
- HPN
- JFK
- LGA
- TEB
- ILG
- PHL
- TTN
- CLT
- USA
Airports in Iran Standard Time
- IKA
- THR
- MHD
- IFN
- PYK
- TBZ
Related conversions
Common conversions
- What is 9:00 am Washington in Tehran?
- 9:00 am Washington is 4:30 pm Tehran.
- What is 12:00 pm Washington in Tehran?
- 12:00 pm Washington is 7:30 pm Tehran.
- What is 12:30 pm Washington in Tehran?
- 12:30 pm Washington is 8:00 pm Tehran.
- What is 2:00 pm Washington in Tehran?
- 2:00 pm Washington is 9:30 pm Tehran.
- What is 5:00 pm Washington in Tehran?
- 5:00 pm Washington is 12:30 am Tehran, the next day.
- What is 11:30 pm Washington in Tehran?
- 11:30 pm Washington is 7:00 am Tehran, the next day.