Offset
The time difference between Tehran and Riyadh is 0.5 hours.
Tehran (IRST) is ahead of Riyadh (AST).
IRST: UTC+3:30
AST: UTC+3
Neither Tehran nor Riyadh is currently observing daylight saving time.
When to schedule
Business-hours overlap: 10 AM–5 PM in Tehran (9 AM–4 PM in Riyadh).
Both teams are in working hours during this window on weekdays.
Suggested time: 1:00 PM Tehran (12:30 PM Riyadh).
Note: the working week in Saudi Arabia runs Sunday–Thursday; Friday–Saturday is the weekend, so overlap on those days is limited.
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Tehran | Riyadh | Day |
|---|---|---|
| 12:00 am | 11:30 pm | -1 day |
| 1:00 am | 12:30 am | Same day |
| 2:00 am | 1:30 am | Same day |
| 3:00 am | 2:30 am | Same day |
| 4:00 am | 3:30 am | Same day |
| 5:00 am | 4:30 am | Same day |
| 6:00 am | 5:30 am | Same day |
| 7:00 am | 6:30 am | Same day |
| 8:00 am | 7:30 am | Same day |
| 9:00 am | 8:30 am | Same day |
| 10:00 am | 9:30 am | Same day |
| 11:00 am | 10:30 am | Same day |
| 12:00 pm | 11:30 am | Same day |
| 1:00 pm | 12:30 pm | Same day |
| 2:00 pm | 1:30 pm | Same day |
| 3:00 pm | 2:30 pm | Same day |
| 4:00 pm | 3:30 pm | Same day |
| 5:00 pm | 4:30 pm | Same day |
| 6:00 pm | 5:30 pm | Same day |
| 7:00 pm | 6:30 pm | Same day |
| 8:00 pm | 7:30 pm | Same day |
| 9:00 pm | 8:30 pm | Same day |
| 10:00 pm | 9:30 pm | Same day |
| 11:00 pm | 10:30 pm | Same day |
Daylight saving time
Neither Tehran nor Riyadh observes daylight saving time. The offset between these zones remains constant year-round.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 4:49 AM
- Sunset
- 7:19 PM
- Day length
- 14h 30m
- Sunrise
- 5:04 AM
- Sunset
- 6:42 PM
- Day length
- 13h 37m
Daylight overlap: 13h 37m — 5:34 AM–7:12 PM in Tehran (5:04 AM–6:42 PM in Riyadh). Both locations are in daylight during this window.
Cities in these zones
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Iran Standard Time
- IKA
- THR
- MHD
- IFN
- PYK
- TBZ
Airports in Arabia Standard Time
- JED
- RUH
- MED
- DMM
Related conversions
Common conversions
- What is 9:00 am Tehran in Riyadh?
- 9:00 am Tehran is 8:30 am Riyadh.
- What is 12:00 pm Tehran in Riyadh?
- 12:00 pm Tehran is 11:30 am Riyadh.
- What is 12:30 pm Tehran in Riyadh?
- 12:30 pm Tehran is 12:00 pm Riyadh.
- What is 2:00 pm Tehran in Riyadh?
- 2:00 pm Tehran is 1:30 pm Riyadh.
- What is 5:00 pm Tehran in Riyadh?
- 5:00 pm Tehran is 4:30 pm Riyadh.
- What is 11:30 pm Tehran in Riyadh?
- 11:30 pm Tehran is 11:00 pm Riyadh.