| Guyancourt Ciudad Juarez | Mountain Time | 08:00 |
| Guyancourt Manhattan | Eastern Time | 06:00 |
| Guyancourt Asuncion | Paraguay Time | 06:00 |
| Guyancourt Recife | Brasilia Time | 05:00 |
| Guyancourt Daejeon | Korean Time | -07:00 |
| Guyancourt San Antonio | Central Time | 07:00 |
| Guyancourt Kumasi | Greenwich Mean Time | 02:00 |
| Guyancourt Kota Bharu | Malaysia Time | -06:00 |
| Guyancourt Kyoto | Japan Time | -07:00 |
| Guyancourt Kuala Lumpur | Malaysia Time | -06:00 |
| Guyancourt Karaj | Iran Time | -02:30 |
| Guyancourt Kathmandu | Nepal Time | -03:45 |
| Guyancourt Palembang | Western Indonesia Time | -05:00 |
| Guyancourt Multan | Pakistan Time | -03:00 |
| Guyancourt Tirunelveli | India Standard Time | -03:30 |
| Guyancourt Hanoi | Indochina Time | -05:00 |
| Guyancourt Kharkiv | Eastern European Time | -01:00 |
| Guyancourt Agra | India Standard Time | -03:30 |
| Guyancourt Córdoba | Argentina Time | 05:00 |
| Guyancourt Tabriz | Iran Time | -02:30 |
| Guyancourt Novosibirsk | Novosibirsk Time | -05:00 |
| Guyancourt Gwangju | Korean Time | -07:00 |
| Guyancourt Bursa | Turkey Time | -01:00 |
| Guyancourt Vadodara | India Standard Time | -03:30 |
| Guyancourt Belém | Brasilia Time | 05:00 |
| Guyancourt Fushun | China Time | -06:00 |
| Guyancourt Quito | Ecuador Time | 07:00 |
| Guyancourt San Diego | Pacific Time | 09:00 |
| Guyancourt Fukuoka | Japan Time | -07:00 |
| Guyancourt Antananarivo | East Africa Time | -01:00 |
| Guyancourt Luoyang | China Time | -06:00 |
| Guyancourt Hyderabad | Pakistan Time | -03:00 |
| Guyancourt Borough of Bronx | Eastern Time | 06:00 |
| Guyancourt Valencia | Venezuela Time | 06:00 |
| Guyancourt Gujranwala | Pakistan Time | -03:00 |
| Guyancourt Barranquilla | Colombia Time | 07:00 |
| Guyancourt Guankou | China Time | -06:00 |
| Guyancourt Tijuana | Pacific Time | 09:00 |
| Guyancourt Lubumbashi | Central Africa Time | 00:00 |
| Guyancourt Porto Alegre | Brasilia Time | 05:00 |
| Guyancourt Tangerang | Western Indonesia Time | -05:00 |
| Guyancourt Santa Cruz | Bolivia Time | 06:00 |
| Guyancourt Handan | China Time | -06:00 |
| Guyancourt Kampala | East Africa Time | -01:00 |
| Guyancourt Yekaterinburg | Yekaterinburg Time | -03:00 |
| Guyancourt Khulna | Bangladesh Time | -04:00 |
| Guyancourt Douala | West Africa Time | 01:00 |
| Guyancourt Gorakhpur | India Standard Time | -03:30 |
| Guyancourt Mecca | Arabian Time | -01:00 |
| Guyancourt Makassar | Central Indonesia Time | -06:00 |