London zone
GMT+1 (GMT+1)
Istanbul zone
GMT+3 (GMT+3)
Difference
2 hours ahead of London
Business overlap
6h (9-5 windows)
Working hours overlap
Each cell is one hour in London. Filled cells mark when 9 AM – 5 PM in London and Istanbul both apply.
6 hours per day
- London
- GMT+1
- Istanbul
- GMT+3
- Difference
- +2h
- Business overlap
- 6h
Hour-by-hour conversion
Each row shows the matching local time in Istanbul for an hour in London.
| London | Istanbul | Day | Window |
|---|---|---|---|
| 12:00 AM | 2:00 AM | same day | — |
| 1:00 AM | 3:00 AM | same day | — |
| 2:00 AM | 4:00 AM | same day | — |
| 3:00 AM | 5:00 AM | same day | — |
| 4:00 AM | 6:00 AM | same day | — |
| 5:00 AM | 7:00 AM | same day | — |
| 6:00 AM | 8:00 AM | same day | — |
| 7:00 AM | 9:00 AM | same day | — |
| 8:00 AM | 10:00 AM | same day | — |
| 9:00 AM | 11:00 AM | same day | Both 9-5 |
| 10:00 AM | 12:00 PM | same day | Both 9-5 |
| 11:00 AM | 1:00 PM | same day | Both 9-5 |
| 12:00 PM | 2:00 PM | same day | Both 9-5 |
| 1:00 PM | 3:00 PM | same day | Both 9-5 |
| 2:00 PM | 4:00 PM | same day | Both 9-5 |
| 3:00 PM | 5:00 PM | same day | — |
| 4:00 PM | 6:00 PM | same day | — |
| 5:00 PM | 7:00 PM | same day | — |
| 6:00 PM | 8:00 PM | same day | — |
| 7:00 PM | 9:00 PM | same day | — |
| 8:00 PM | 10:00 PM | same day | — |
| 9:00 PM | 11:00 PM | same day | — |
| 10:00 PM | 12:00 AM | next day | — |
| 11:00 PM | 1:00 AM | next day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 9:00 AM – 3:00 PM in London time. That gives you 6 hours per workday for live meetings.
Tighter overlap is achievable by having the side with later working hours start earlier, or by treating the first and last hours of each side as flexible. The bar above marks every hour where both cities sit inside a 9 AM – 5 PM window.
About converting London time to Istanbul time
London follows the Europe/London time zone (currently GMT+1, GMT+1), while Istanbul follows Europe/Istanbul (currently GMT+3, GMT+3). Istanbul is 2 hours ahead of London right now.
London observes daylight saving time, while Istanbul does not. The offset between the two cities changes by one hour at the daylight saving transitions.
Daylight saving transitions in 2026
London
- Spring forward · Sunday, March 29, 2026
- Fall back · Sunday, October 25, 2026
Istanbul
Does not observe daylight saving time.
Reverse this conversion
Istanbul to London
Open the converter
Plan a meeting between London and Istanbul
More conversions from London
Frequently asked questions
- How many hours is London from Istanbul?
- Istanbul is 2 hours ahead of London right now.
- What time is 9:00 AM London in Istanbul?
- 9:00 AM in London is 11:00 AM in Istanbul.
- What time is 5:00 PM London in Istanbul?
- 5:00 PM in London is 7:00 PM in Istanbul.
- When do London and Istanbul business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 6 hours, roughly from 9:00 AM to 3:00 PM in London time.
- Does daylight saving time change the difference between London and Istanbul?
- London observes daylight saving time while Istanbul does not, so the offset between them changes by one hour twice a year.
Local time page
Time in London
Local time page
Time in Istanbul