Offset
The time difference between Gulf Standard Time and Iran Standard Time is 0.5 hours.
Gulf Standard Time (GST) is ahead of Iran Standard Time (IRST).
GST: UTC+4
IRST: UTC+3:30
Neither Gulf Standard Time nor Iran Standard Time is currently observing daylight saving time.
When to schedule
Business-hours overlap: 10 AM–5 PM in Gulf Standard Time (9 AM–4 PM in Iran Standard Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 1:00 PM Gulf Standard Time (12:30 PM Iran Standard Time).
About these zones
Gulf Standard Time is also known as GST. To call United Arab Emirates, dial +971.
Iran Standard Time is also known as IRST. To call Iran, dial +98.
Iran Standard Time is approximately 750 miles north of Gulf Standard Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| GST | IRST | 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 Gulf Standard Time nor Iran Standard Time 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
- 5:29 AM
- Sunset
- 7:07 PM
- Day length
- 13h 38m
- Sunrise
- 4:50 AM
- Sunset
- 7:18 PM
- Day length
- 14h 28m
Daylight overlap: 13h 38m — 5:29 AM–7:07 PM in Gulf Standard Time (4:59 AM–6:37 PM in Iran Standard Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Gulf Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Gulf Standard Time
- DWC
- DXB
- SHJ
- AUH
Airports in Iran Standard Time
- IKA
- THR
- MHD
- IFN
- PYK
- TBZ
Related conversions
Common conversions
- What is 9:00 am GST in IRST?
- 9:00 am GST is 8:30 am IRST.
- What is 12:00 pm GST in IRST?
- 12:00 pm GST is 11:30 am IRST.
- What is 12:30 pm GST in IRST?
- 12:30 pm GST is 12:00 pm IRST.
- What is 2:00 pm GST in IRST?
- 2:00 pm GST is 1:30 pm IRST.
- What is 5:00 pm GST in IRST?
- 5:00 pm GST is 4:30 pm IRST.
- What is 11:30 pm GST in IRST?
- 11:30 pm GST is 11:00 pm IRST.