Offset
The time difference between Greenwich Mean Time and Phnom Penh is 6 hours.
Greenwich Mean Time (BST) is behind Phnom Penh (ICT).
BST: UTC+1
ICT: UTC+7
Greenwich Mean Time is currently observing daylight saving time; Phnom Penh is not.
When to schedule
Business-hours overlap: 9 AM–11 AM in Greenwich Mean Time (3 PM–5 PM in Phnom Penh).
Both teams are in working hours during this window on weekdays.
Suggested time: 10:00 AM Greenwich Mean Time (4:00 PM Phnom Penh).
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 Kingdom
- Good FridayFri, Apr 3
- Early May Bank HolidayMon, May 4
- Spring Bank HolidayMon, May 25
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
About these zones
Greenwich Mean Time is also known as GMT, or BST. To call United Kingdom, dial +44.
Phnom Penh uses Indochina Time (ICT). To call Cambodia, dial +855.
Phnom Penh is approximately 6,200 miles east of Greenwich Mean Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| GMT | Phnom Penh | Day |
|---|---|---|
| 12:00 am | 6:00 am | Same day |
| 1:00 am | 7:00 am | Same day |
| 2:00 am | 8:00 am | Same day |
| 3:00 am | 9:00 am | Same day |
| 4:00 am | 10:00 am | Same day |
| 5:00 am | 11:00 am | Same day |
| 6:00 am | 12:00 pm | Same day |
| 7:00 am | 1:00 pm | Same day |
| 8:00 am | 2:00 pm | Same day |
| 9:00 am | 3:00 pm | Same day |
| 10:00 am | 4:00 pm | Same day |
| 11:00 am | 5:00 pm | Same day |
| 12:00 pm | 6:00 pm | Same day |
| 1:00 pm | 7:00 pm | Same day |
| 2:00 pm | 8:00 pm | Same day |
| 3:00 pm | 9:00 pm | Same day |
| 4:00 pm | 10:00 pm | Same day |
| 5:00 pm | 11:00 pm | Same day |
| 6:00 pm | 12:00 am | +1 day |
| 7:00 pm | 1:00 am | +1 day |
| 8:00 pm | 2:00 am | +1 day |
| 9:00 pm | 3:00 am | +1 day |
| 10:00 pm | 4:00 am | +1 day |
| 11:00 pm | 5:00 am | +1 day |
Daylight saving time
Greenwich Mean Time observes daylight saving time; Phnom Penh does not. The offset between the two zones changes when Greenwich Mean Time transitions: on Sunday, October 25, 2026, clocks fall back from BST to GMT.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 4:47 AM
- Sunset
- 9:13 PM
- Day length
- 16h 25m
- Sunrise
- 5:37 AM
- Sunset
- 6:23 PM
- Day length
- 12h 46m
Daylight overlap: 7h 36m — 4:47 AM–12:23 PM in Greenwich Mean Time (10:47 AM–6:23 PM in Phnom Penh). Both locations are in daylight during this window.
Cities in these zones
Cities in Greenwich Mean Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Greenwich Mean Time
- LCY
- LGW
- LHR
- LTN
- STN
- BHX
- EMA
- GLA
- PIK
- LBA
Airports in Indochina Time
- KTI
Related conversions
Common conversions
- What is 9:00 am GMT in Phnom Penh?
- 9:00 am GMT is 3:00 pm Phnom Penh.
- What is 12:00 pm GMT in Phnom Penh?
- 12:00 pm GMT is 6:00 pm Phnom Penh.
- What is 12:30 pm GMT in Phnom Penh?
- 12:30 pm GMT is 6:30 pm Phnom Penh.
- What is 2:00 pm GMT in Phnom Penh?
- 2:00 pm GMT is 8:00 pm Phnom Penh.
- What is 5:00 pm GMT in Phnom Penh?
- 5:00 pm GMT is 11:00 pm Phnom Penh.
- What is 11:30 pm GMT in Phnom Penh?
- 11:30 pm GMT is 5:30 am Phnom Penh, the next day.