Istanbul to Boulogne-Billancourt: time difference
Boulogne-Billancourt is 1 h behind Istanbul. Live clocks for both, the working hours they share, and how each one sits against your own time.
🇫🇷 Boulogne-Billancourt, France
58
- Central European Summer Time
- UTC+2
- Night
☀️ 08:13 · 🌙 19:02 · 10 h 49 min
−1 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Istanbul 04:20 4:20 AM Boulogne-Billancourt 03:20 3:20 AM You –:–
04:20 4:20 AM
GMT+03:00 · UTC+3
☀️ 07:17 · 🌙 18:24
03:20 3:20 AM
Central European Summer Time · UTC+2
☀️ 08:13 · 🌙 19:02
·
−1 h
Boulogne-Billancourt is 1 h behind Istanbul.
When you, Istanbul and Boulogne-Billancourt are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇹🇷 Istanbul
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇫🇷 Boulogne-Billancourt
23 11 PM 0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇹🇷 Istanbul | 🇫🇷 Boulogne-Billancourt |
|---|---|---|
| Local time | 04:20 | 03:20 |
| Local date | Friday, October 16, 2026 | Friday, October 16, 2026 |
| Time zone | GMT+03:00 | Central European Summer Time |
| UTC offset | UTC+3 | UTC+2 |
| Offset from Istanbul | — | −1 h |
| IANA zone | Europe/Istanbul | Europe/Paris |
| Daylight saving | Not observed | On summer time → UTC+1, Oct 25, 02:00 |
| Sunrise | 07:17 | 08:13 |
| Sunset | 18:24 | 19:02 |
| Daylight | 11 h 7 min | 10 h 49 min |
| People on this clock | 15,701,602 | 119,808 |
Compare Istanbul with another city
More comparisons with Istanbul: the time zones next to it and the far side of the clock.
Big time differences
Istanbul and Boulogne-Billancourt: common questions
How many hours behind Istanbul is Boulogne-Billancourt?
The clocks in Boulogne-Billancourt are 1 hour behind those in Istanbul (UTC+2 and UTC+3).
What time is it in Boulogne-Billancourt at the start of the working day in Istanbul?
The working day in Istanbul starts at 9:00 AM; in Boulogne-Billancourt it is 8:00 AM at that moment.
What time is it in Boulogne-Billancourt at the end of the working day in Istanbul?
The working day in Istanbul ends at 6:00 PM; in Boulogne-Billancourt it is 5:00 PM at that moment.
Is there a time when both Istanbul and Boulogne-Billancourt are at work?
Yes: from 10:00 AM to 6:00 PM in Istanbul (9:00 AM to 5:00 PM in Boulogne-Billancourt), the working days (9:00 AM–6:00 PM) overlap.
When is it still the previous day in Boulogne-Billancourt?
Until 1:00 AM in Istanbul it is still the previous day in Boulogne-Billancourt. The other way round, from 11:00 PM in Boulogne-Billancourt it is already the next day in Istanbul.
Does the time difference between Istanbul and Boulogne-Billancourt change?
Yes. The clocks change only in Boulogne-Billancourt. From October 25, 2026, Boulogne-Billancourt will be 2 hours behind Istanbul.
