| Guyancourt Goiânia | Brasilia Time | 05:00 |
| Guyancourt Guarulhos | Brasilia Time | 05:00 |
| Guyancourt Prague | Central European Time | 00:00 |
| Guyancourt Varanasi | India Standard Time | -03:30 |
| Guyancourt Copenhagen | Central European Time | 00:00 |
| Guyancourt Sofia | Eastern European Time | -01:00 |
| Guyancourt Tripoli | Eastern European Time | 00:00 |
| Guyancourt Port Harcourt | West Africa Time | 01:00 |
| Guyancourt Hiroshima | Japan Time | -07:00 |
| Guyancourt Lijiang | China Time | -06:00 |
| Guyancourt Dubai | Gulf Standard Time | -02:00 |
| Guyancourt Samara | Samara Time | -02:00 |
| Guyancourt Omsk | Omsk Time | -04:00 |
| Guyancourt Benin City | West Africa Time | 01:00 |
| Guyancourt Monterrey | Central Time | 07:00 |
| Guyancourt Malingao | Philippine Time | -06:00 |
| Guyancourt Baku | Azerbaijan Time | -02:00 |
| Guyancourt Leon | Central Time | 07:00 |
| Guyancourt Maiduguri | West Africa Time | 01:00 |
| Guyancourt Kazan | Moscow Time | -01:00 |
| Guyancourt Yerevan | Armenia Time | -02:00 |
| Guyancourt Amritsar | India Standard Time | -03:30 |
| Guyancourt Ouagadougou | Greenwich Mean Time | 02:00 |
| Guyancourt Yono | Japan Time | -07:00 |
| Guyancourt Rostov-on-Don | Moscow Time | -01:00 |
| Guyancourt Allahabad | India Standard Time | -03:30 |
| Guyancourt Goyang-si | Korean Time | -07:00 |
| Guyancourt Gaziantep | Turkey Time | -01:00 |
| Guyancourt Visakhapatnam | India Standard Time | -03:30 |
| Guyancourt Sendai | Japan Time | -07:00 |
| Guyancourt Chelyabinsk | Yekaterinburg Time | -03:00 |
| Guyancourt Datong | China Time | -06:00 |
| Guyancourt Tbilisi | Georgia Time | -02:00 |
| Guyancourt Changshu City | China Time | -06:00 |
| Guyancourt Taichung | Taipei Time | -06:00 |
| Guyancourt Theni | India Standard Time | -03:30 |
| Guyancourt Xianyang | China Time | -06:00 |
| Guyancourt Ufa | Yekaterinburg Time | -03:00 |
| Guyancourt Dnepropetrovsk | Eastern European Time | -01:00 |
| Guyancourt Seongnam-si | Korean Time | -07:00 |
| Guyancourt Campinas | Brasilia Time | 05:00 |
| Guyancourt Jabalpur | India Standard Time | -03:30 |
| Guyancourt Howrah | India Standard Time | -03:30 |
| Guyancourt Huainan | China Time | -06:00 |
| Guyancourt San Jose | Pacific Time | 09:00 |
| Guyancourt Donetsk | Eastern European Time | -01:00 |
| Guyancourt Dublin | Ireland Time | 01:00 |
| Guyancourt Calgary | Mountain Time | 08:00 |
| Guyancourt Brussels | Central European Time | 00:00 |
| Guyancourt Aurangabad | India Standard Time | -03:30 |