Offset
The time difference between Istanbul and Oslo is 1 hour.
Istanbul (TRT) is ahead of Oslo (CEST).
TRT: UTC+3
CEST: UTC+2
Oslo is currently observing daylight saving time; Istanbul is not.
When to schedule
Business-hours overlap: 10 AM–5 PM in Istanbul (9 AM–4 PM in Oslo).
Both teams are in working hours during this window on weekdays.
Suggested time: 1:00 PM Istanbul (12:00 PM Oslo).
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.
Turkey
- New Year's DayThu, Jan 1
- National Independence & Children's DayThu, Apr 23
- Labour DayFri, May 1
- Atatürk Commemoration & Youth DayTue, May 19
- Democracy and National Unity DayWed, Jul 15
- Victory DaySun, Aug 30
- Republic DayThu, Oct 29
Norway
- New Year's DayThu, Jan 1
- Maundy ThursdayThu, Apr 2
- Good FridayFri, Apr 3
- Easter SundaySun, Apr 5
- Easter MondayMon, Apr 6
- Labour DayFri, May 1
- Ascension DayThu, May 14
- Constitution DaySun, May 17
- PentecostSun, May 24
- Whit MondayMon, May 25
- Christmas DayFri, Dec 25
- St. Stephen's DaySat, Dec 26
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Istanbul | Oslo | Day |
|---|---|---|
| 12:00 am | 11:00 pm | -1 day |
| 1:00 am | 12:00 am | Same day |
| 2:00 am | 1:00 am | Same day |
| 3:00 am | 2:00 am | Same day |
| 4:00 am | 3:00 am | Same day |
| 5:00 am | 4:00 am | Same day |
| 6:00 am | 5:00 am | Same day |
| 7:00 am | 6:00 am | Same day |
| 8:00 am | 7:00 am | Same day |
| 9:00 am | 8:00 am | Same day |
| 10:00 am | 9:00 am | Same day |
| 11:00 am | 10:00 am | Same day |
| 12:00 pm | 11:00 am | Same day |
| 1:00 pm | 12:00 pm | Same day |
| 2:00 pm | 1:00 pm | Same day |
| 3:00 pm | 2:00 pm | Same day |
| 4:00 pm | 3:00 pm | Same day |
| 5:00 pm | 4:00 pm | Same day |
| 6:00 pm | 5:00 pm | Same day |
| 7:00 pm | 6:00 pm | Same day |
| 8:00 pm | 7:00 pm | Same day |
| 9:00 pm | 8:00 pm | Same day |
| 10:00 pm | 9:00 pm | Same day |
| 11:00 pm | 10:00 pm | Same day |
Daylight saving time
Oslo observes daylight saving time; Istanbul does not. The offset between the two zones changes when Oslo transitions: on Sunday, October 25, 2026, clocks fall back from CEST to CET.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:33 AM
- Sunset
- 8:36 PM
- Day length
- 15h 3m
- Sunrise
- 3:59 AM
- Sunset
- 10:35 PM
- Day length
- 18h 37m
Daylight overlap: 15h 3m — 5:33 AM–8:36 PM in Istanbul (4:33 AM–7:36 PM in Oslo). Both locations are in daylight during this window.
Cities in these zones
Other cities in Turkey Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Turkey Time
- IST
- SAW
- ESB
- YEI
- ADB
- GZT
- DIY
- ADA
- COV
- ASR
Airports in Central European Time
- OSL
Related conversions
Common conversions
- What is 9:00 am Istanbul in Oslo?
- 9:00 am Istanbul is 8:00 am Oslo.
- What is 12:00 pm Istanbul in Oslo?
- 12:00 pm Istanbul is 11:00 am Oslo.
- What is 12:30 pm Istanbul in Oslo?
- 12:30 pm Istanbul is 11:30 am Oslo.
- What is 2:00 pm Istanbul in Oslo?
- 2:00 pm Istanbul is 1:00 pm Oslo.
- What is 5:00 pm Istanbul in Oslo?
- 5:00 pm Istanbul is 4:00 pm Oslo.
- What is 11:30 pm Istanbul in Oslo?
- 11:30 pm Istanbul is 10:30 pm Oslo.