What is the ISO week number in Guyancourt?

TimeDials shows the current ISO week number for Guyancourt in real time. ISO week numbers follow the ISO 8601 standard, where week 1 is the week containing the first Thursday of the year.

Does Guyancourt observe daylight saving time (DST)?

Yes, Guyancourt observes daylight saving time. The next clock change is on 2026-03-29 (clocks move forward to GMT+2).

Time in Guyancourt, Île-de-France, France — Local Time & Date

Live

--:--:--

Current local time in 🇫🇷 Guyancourt, Île-de-France, France.

CET/CEST UTC+01:00

Relative to You

Detecting your timezone…

Relative to UTC

+1 hours ahead

Noon here = 11:00 UTC

09:00 here = 08:00 UTC

12:00 here = 11:00 UTC

17:00 here = 16:00 UTC

ISO Week

11 Odd Week

Sun

07:11

18:33

Today

Mid-morning in Guyancourt. Offices are busy, meetings are underway. The current offset is UTC+01:00.

Daylight Saving Time

Last Clock Change

2025-10-26

Clocks moved back to GMT+1

Next Clock Change

2026-03-29

Clocks will move forward to GMT+2

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Quick Facts

Country	🇫🇷France
State / Region	Île-de-France
Timezone	CET/CEST
UTC Offset	UTC+01:00
DST	Yes — daylight saving time observed
Population	31,989
Elevation	161 m
Sunrise	07:11
Sunset	18:33
Coordinates	48.77°N, 2.07°E

Map

Map data © OpenStreetMap contributors

Time Difference to Major Cities

City	Difference	Local Time
New York	-5h	--:--
Los Angeles	-8h	--:--
London	-1h	--:--
Dubai	+3h	--:--
Mumbai	+4h 30m	--:--
Singapore	+7h	--:--
Tokyo	+8h	--:--
Sydney	+10h	--:--
Sao Paulo	-4h	--:--
Cairo	+1h	--:--
Shanghai	+7h	--:--

Frequently Asked Questions

What are the business hours in Guyancourt?

Standard business hours in Guyancourt are 09:00–17:00 local time (CET/CEST). Check the live clock above to see the current local time. Use our Time Zone Planner to find the best meeting time across cities.

What is the UTC offset for Guyancourt?

Guyancourt is currently at UTC+01:00. The timezone identifier is CET/CEST. When it is noon in Guyancourt, it is 11:00 UTC. You can embed a live Guyancourt clock on your website.

What ISO week number is it in Guyancourt?

It is currently ISO week 11 (odd week) in Guyancourt. ISO week numbers follow the ISO 8601 standard, where week 1 is the week containing the first Thursday of the year. Learn more about ISO week numbers.

Does Guyancourt observe daylight saving time?

Yes, Guyancourt observes daylight saving time (DST). The most recent change was on 2025-10-26, when clocks moved back to GMT+1. The next change is on 2026-03-29, when clocks will move forward to GMT+2.