Lisbon to Guyancourt: time difference
Guyancourt is 1 h ahead of Lisbon. Live clocks for both, the working hours they share, and how each one sits against your own time.
+1 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Lisbon 01:44 1:44 AM Guyancourt 02:44 2:44 AM You –:–
01:44 1:44 AM
Western European Summer Time · UTC+1
☀️ 07:52 · 🌙 18:52
02:44 2:44 AM
Central European Summer Time · UTC+2
☀️ 08:21 · 🌙 18:53
·
+1 h
Guyancourt is 1 h ahead of Lisbon.
When you, Lisbon and Guyancourt are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇵🇹 Lisbon
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
🇫🇷 Guyancourt
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 0 12 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇵🇹 Lisbon | 🇫🇷 Guyancourt |
|---|---|---|
| Local time | 01:44 | 02:44 |
| Local date | Wednesday, October 21, 2026 | Wednesday, October 21, 2026 |
| Time zone | Western European Summer Time | Central European Summer Time |
| UTC offset | UTC+1 | UTC+2 |
| Offset from Lisbon | — | +1 h |
| IANA zone | Europe/Lisbon | Europe/Paris |
| Daylight saving | On summer time → UTC+0, Oct 25, 01:00 | On summer time → UTC+1, Oct 25, 02:00 |
| Sunrise | 07:52 | 08:21 |
| Sunset | 18:52 | 18:53 |
| Daylight | 10 h 59 min | 10 h 32 min |
| People on this clock | 545,923 | 29,406 |
Compare Lisbon with another city
More comparisons with Lisbon: the time zones next to it and the far side of the clock.
Big time differences
Lisbon and Guyancourt: common questions
How far ahead of Lisbon is Guyancourt?
Guyancourt is 1 hour ahead of Lisbon: UTC+2 against UTC+1.
What time is it in Guyancourt at the start of the working day in Lisbon?
The working day in Lisbon starts at 9:00 AM; in Guyancourt it is 10:00 AM at that moment.
What time is it in Guyancourt at the end of the working day in Lisbon?
The working day in Lisbon ends at 6:00 PM; in Guyancourt it is 7:00 PM at that moment.
When do working hours in Lisbon and in Guyancourt overlap?
Working hours (9:00 AM–6:00 PM) overlap from 9:00 AM to 5:00 PM in Lisbon, which is 10:00 AM to 6:00 PM in Guyancourt.
From what time in Lisbon is it tomorrow in Guyancourt?
Once it is 11:00 PM in Lisbon, the date in Guyancourt has already changed. Until 1:00 AM in Guyancourt, it is still the previous day in Lisbon.
Does the time difference between Lisbon and Guyancourt change?
No. The clocks in Lisbon and in Guyancourt change on the same dates, so the difference stays 1 hour.
