| Guyancourt Siping | China Time | -06:00 |
| Guyancourt Kagoshima | Japan Time | -07:00 |
| Guyancourt Surakarta | Western Indonesia Time | -05:00 |
| Guyancourt Huai'an | China Time | -06:00 |
| Guyancourt Bhavnagar | India Standard Time | -03:30 |
| Guyancourt Mar del Plata | Argentina Time | 05:00 |
| Guyancourt Bahawalpur | Pakistan Time | -03:00 |
| Guyancourt Zāhedān | Iran Time | -02:30 |
| Guyancourt Aden | Arabian Time | -01:00 |
| Guyancourt Nanded | India Standard Time | -03:30 |
| Guyancourt Orenburg | Yekaterinburg Time | -03:00 |
| Guyancourt Pristina | Central European Time | 00:00 |
| Guyancourt Changwon | Korean Time | -07:00 |
| Guyancourt Jiamusi | China Time | -06:00 |
| Guyancourt Antipolo | Philippine Time | -06:00 |
| Guyancourt Neijiang | China Time | -06:00 |
| Guyancourt Bremen | Central European Time | 00:00 |
| Guyancourt Meknes | Western European Time | 01:00 |
| Guyancourt Sharjah | Gulf Standard Time | -02:00 |
| Guyancourt Banciao | Taipei Time | -06:00 |
| Guyancourt Sargodha | Pakistan Time | -03:00 |
| Guyancourt Bangui | West Africa Time | 01:00 |
| Guyancourt Vilnius | Eastern European Time | -01:00 |
| Guyancourt Cancún | Eastern Time | 07:00 |
| Guyancourt Yangzhou | China Time | -06:00 |
| Guyancourt Novokuznetsk | Novokuznetsk Time | -05:00 |
| Guyancourt Kisangani | Central Africa Time | 00:00 |
| Guyancourt Port Said | Eastern European Time | 00:00 |
| Guyancourt Mersin | Turkey Time | -01:00 |
| Guyancourt Warri | West Africa Time | 01:00 |
| Guyancourt Guli | China Time | -06:00 |
| Guyancourt Ebute Ikorodu | West Africa Time | 01:00 |
| Guyancourt Taku | China Time | -06:00 |
| Guyancourt Jiangmen | China Time | -06:00 |
| Guyancourt Tucson | Mountain Time | 09:00 |
| Guyancourt Nashville | Central Time | 07:00 |
| Guyancourt Taif | Arabian Time | -01:00 |
| Guyancourt Beira | Central Africa Time | 00:00 |
| Guyancourt Guntur | India Standard Time | -03:30 |
| Guyancourt Touba | Greenwich Mean Time | 02:00 |
| Guyancourt Quebec City | Eastern Time | 06:00 |
| Guyancourt Hamedan | Iran Time | -02:30 |
| Guyancourt Cangzhou | China Time | -06:00 |
| Guyancourt San Salvador | Central Time | 08:00 |
| Guyancourt Santa María Chimalhuacán | Central Time | 07:00 |
| Guyancourt Torreón | Central Time | 07:00 |
| Guyancourt Dehradun | India Standard Time | -03:30 |
| Guyancourt Cuiabá | Amazon Time | 06:00 |
| Guyancourt Cuauhtémoc | Central Time | 07:00 |
| Guyancourt Ciudad López Mateos | Central Time | 07:00 |