| Guyancourt Volgograd | Volgograd Time | -01:00 |
| Guyancourt Nova Iguaçu | Brasilia Time | 05:00 |
| Guyancourt Jieyang | China Time | -06:00 |
| Guyancourt Odessa | Eastern European Time | -01:00 |
| Guyancourt Shivaji Nagar | India Standard Time | -03:30 |
| Guyancourt Zhu Cheng City | China Time | -06:00 |
| Guyancourt Kitakyushu | Japan Time | -07:00 |
| Guyancourt Solapur | India Standard Time | -03:30 |
| Guyancourt Baoding | China Time | -06:00 |
| Guyancourt Guatemala City | Central Time | 08:00 |
| Guyancourt Benxi | China Time | -06:00 |
| Guyancourt Zapopan | Central Time | 07:00 |
| Guyancourt Birmingham | United Kingdom Time | 01:00 |
| Guyancourt Perm | Yekaterinburg Time | -03:00 |
| Guyancourt Srinagar | India Standard Time | -03:30 |
| Guyancourt Zaria | West Africa Time | 01:00 |
| Guyancourt Managua | Central Time | 08:00 |
| Guyancourt Port Elizabeth | South Africa Standard Time | 00:00 |
| Guyancourt Fes | Western European Time | 01:00 |
| Guyancourt Cologne | Central European Time | 00:00 |
| Guyancourt Ulsan | Korean Time | -07:00 |
| Guyancourt Chandigarh | India Standard Time | -03:30 |
| Guyancourt Coimbatore | India Standard Time | -03:30 |
| Guyancourt Naples | Central European Time | 00:00 |
| Guyancourt Maceió | Brasilia Time | 05:00 |
| Guyancourt Cartagena | Colombia Time | 07:00 |
| Guyancourt Changzhou | China Time | -06:00 |
| Guyancourt Sulţānah | Arabian Time | -01:00 |
| Guyancourt Monrovia | Greenwich Mean Time | 02:00 |
| Guyancourt Kingston | Eastern Time | 07:00 |
| Guyancourt Erbil | Arabian Time | -01:00 |
| Guyancourt Austin | Central Time | 07:00 |
| Guyancourt Krasnoyarsk | Krasnoyarsk Time | -05:00 |
| Guyancourt Naypyitaw | Myanmar Time | -04:30 |
| Guyancourt Jodhpur | India Standard Time | -03:30 |
| Guyancourt Chiba | Japan Time | -07:00 |
| Guyancourt São Luís | Brasilia Time | 05:00 |
| Guyancourt Madurai | India Standard Time | -03:30 |
| Guyancourt Sale | Western European Time | 01:00 |
| Guyancourt Huaibei | China Time | -06:00 |
| Guyancourt Cochabamba | Bolivia Time | 06:00 |
| Guyancourt Abobo | Greenwich Mean Time | 02:00 |
| Guyancourt Kaifeng | China Time | -06:00 |
| Guyancourt Abu Ghraib | Arabian Time | -01:00 |
| Guyancourt Qom | Iran Time | -02:30 |
| Guyancourt Bishkek | Kyrgyzstan Time | -04:00 |
| Guyancourt Guwahati | India Standard Time | -03:30 |
| Guyancourt Aba | West Africa Time | 01:00 |
| Guyancourt Pingdingshan | China Time | -06:00 |
| Guyancourt Gwalior | India Standard Time | -03:30 |