Istanbul zone
GMT+3 (GMT+3)
London zone
GMT+1 (GMT+1)
Difference
2 hours behind Istanbul
Business overlap
6h (9-5 windows)
Working hours overlap
Each cell is one hour in Istanbul. Filled cells mark when 9 AM – 5 PM in Istanbul and London both apply.
6 hours per day
- Istanbul
- GMT+3
- London
- GMT+1
- Difference
- -2h
- Business overlap
- 6h
Hour-by-hour conversion
Each row shows the matching local time in London for an hour in Istanbul.
| Istanbul | London | Day | Window |
|---|---|---|---|
| 12:00 AM | 10:00 PM | previous day | — |
| 1:00 AM | 11:00 PM | previous day | — |
| 2:00 AM | 12:00 AM | same day | — |
| 3:00 AM | 1:00 AM | same day | — |
| 4:00 AM | 2:00 AM | same day | — |
| 5:00 AM | 3:00 AM | same day | — |
| 6:00 AM | 4:00 AM | same day | — |
| 7:00 AM | 5:00 AM | same day | — |
| 8:00 AM | 6:00 AM | same day | — |
| 9:00 AM | 7:00 AM | same day | — |
| 10:00 AM | 8:00 AM | same day | — |
| 11:00 AM | 9:00 AM | same day | Both 9-5 |
| 12:00 PM | 10:00 AM | same day | Both 9-5 |
| 1:00 PM | 11:00 AM | same day | Both 9-5 |
| 2:00 PM | 12:00 PM | same day | Both 9-5 |
| 3:00 PM | 1:00 PM | same day | Both 9-5 |
| 4:00 PM | 2:00 PM | same day | Both 9-5 |
| 5:00 PM | 3:00 PM | same day | — |
| 6:00 PM | 4:00 PM | same day | — |
| 7:00 PM | 5:00 PM | same day | — |
| 8:00 PM | 6:00 PM | same day | — |
| 9:00 PM | 7:00 PM | same day | — |
| 10:00 PM | 8:00 PM | same day | — |
| 11:00 PM | 9:00 PM | same day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 11:00 AM – 5:00 PM in Istanbul 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 Istanbul time to London time
Istanbul follows the Europe/Istanbul time zone (currently GMT+3, GMT+3), while London follows Europe/London (currently GMT+1, GMT+1). London is 2 hours behind Istanbul 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
Istanbul
Does not observe daylight saving time.
London
- Spring forward · Sunday, March 29, 2026
- Fall back · Sunday, October 25, 2026
Reverse this conversion
London to Istanbul
Open the converter
Plan a meeting between Istanbul and London
More conversions from Istanbul
Frequently asked questions
- How many hours is Istanbul from London?
- London is 2 hours behind Istanbul right now.
- What time is 9:00 AM Istanbul in London?
- 9:00 AM in Istanbul is 7:00 AM in London.
- What time is 5:00 PM Istanbul in London?
- 5:00 PM in Istanbul is 3:00 PM in London.
- When do Istanbul and London business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 6 hours, roughly from 11:00 AM to 5:00 PM in Istanbul time.
- Does daylight saving time change the difference between Istanbul and London?
- 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 Istanbul
Local time page
Time in London