| Guyancourt Kottarakkara | India Standard Time | -03:30 |
| Guyancourt Kernen | Central European Time | 00:00 |
| Guyancourt Monroe Township | Eastern Time | 06:00 |
| Guyancourt Junagadh district | India Standard Time | -03:30 |
| Guyancourt Srimushnam | India Standard Time | -03:30 |
| Guyancourt Moniga del Garda | Central European Time | 00:00 |
| Guyancourt Koto | Japan Time | -07:00 |
| Guyancourt Monona | Central Time | 07:00 |
| Guyancourt Srikalahasti | India Standard Time | -03:30 |
| Guyancourt Monkton | Eastern Time | 06:00 |
| Guyancourt Kotobi | Greenwich Mean Time | 02:00 |
| Guyancourt Monmouth | Central Time | 07:00 |
| Guyancourt Yaliyuru | India Standard Time | -03:30 |
| Guyancourt Monastero Bormida | Central European Time | 00:00 |
| Guyancourt Kotor | Central European Time | 00:00 |
| Guyancourt Monastier di Treviso | Central European Time | 00:00 |
| Guyancourt Yallabatharra | Western Australia Time | -06:00 |
| Guyancourt Monguelfo-Tesido | Central European Time | 00:00 |
| Guyancourt Kotor Varoš | Central European Time | 00:00 |
| Guyancourt Mönchengladbach | Central European Time | 00:00 |
| Guyancourt Yallambie | Eastern Australia Time | -08:00 |
| Guyancourt Monchique | Western European Time | 01:00 |
| Guyancourt Kovalam | India Standard Time | -03:30 |
| Guyancourt Keeranur | India Standard Time | -03:30 |
| Guyancourt Kazhakkoottam | India Standard Time | -03:30 |
| Guyancourt Kazhipathur | India Standard Time | -03:30 |
| Guyancourt Kebili | West Africa Time | 01:00 |
| Guyancourt København | Central European Time | 00:00 |
| Guyancourt København | Central European Time | 00:00 |
| Guyancourt København | Central European Time | 00:00 |
| Guyancourt København | Central European Time | 00:00 |
| Guyancourt Keaau | Hawaii-Aleutian Time | 12:00 |
| Guyancourt Jindalee | Eastern Australia Time | -08:00 |
| Guyancourt Jindivick | Eastern Australia Time | -08:00 |
| Guyancourt Jinzhou | China Time | -06:00 |
| Guyancourt Jhikli Ambwari | India Standard Time | -03:30 |
| Guyancourt Jim Thorpe | Eastern Time | 06:00 |
| Guyancourt Jinan | China Time | -06:00 |