| Guantánamo Saint James City | Eastern Time | 00:00 |
| Guantánamo Saint-Jean-Cap-Ferrat | Central European Time | -06:00 |
| Guantánamo Saint-Gilles | Central European Time | -06:00 |
| Guantánamo Saint-Gobain | Central European Time | -06:00 |
| Guantánamo Saint George | Eastern Australia Time | -14:00 |
| Guantánamo Saint-Georges | Eastern Time | 00:00 |
| Guantánamo Saint-Georges | Eastern Time | 00:00 |
| Guantánamo Saint-Georges-sur-Meuse | Central European Time | -06:00 |
| Guantánamo Santa María Huatulco | Central Time | 01:00 |
| Guantánamo Santa Ponça | Central European Time | -06:00 |
| Guantánamo Santa Nella | Pacific Time | 03:00 |
| Guantánamo Santa Oliva | Central European Time | -06:00 |
| Guantánamo Santa Rosa Beach | Central Time | 01:00 |
| Guantánamo Santa Gertrudis de Fruitera | Central European Time | -06:00 |
| Guantánamo Santa Maria A Vico | Central European Time | -06:00 |
| Guantánamo Santa Fe | Argentina Time | -01:00 |
| Guantánamo Santa Cruz | Western European Time | -05:00 |
| Guantánamo Santa Cruz | India Standard Time | -09:30 |
| Guantánamo Sennfeld | Central European Time | -06:00 |
| Guantánamo Senden | Central European Time | -06:00 |
| Guantánamo Sendra | India Standard Time | -09:30 |
| Guantánamo Senegal | Peru Time | 01:00 |
| Guantánamo Sengurichi | India Standard Time | -09:30 |
| Guantánamo Seoul | Korean Time | -13:00 |
| Guantánamo Seoul | Korean Time | -13:00 |
| Guantánamo Sepang | Malaysia Time | -12:00 |
| Guantánamo Sepang | Malaysia Time | -12:00 |
| Guantánamo Serranópolis | Brasilia Time | -01:00 |
| Guantánamo Serdang | Malaysia Time | -12:00 |
| Guantánamo Sequim | Pacific Time | 03:00 |
| Guantánamo Seri Gading | Malaysia Time | -12:00 |
| Guantánamo Seri Kembangan | Malaysia Time | -12:00 |
| Guantánamo Seri Manjung | Malaysia Time | -12:00 |
| Guantánamo Xuchang | China Time | -12:00 |
| Guantánamo Xuzhou | China Time | -12:00 |
| Guantánamo Yaliyuru | India Standard Time | -09:30 |
| Guantánamo Yallabatharra | Western Australia Time | -12:00 |
| Guantánamo Yallambie | Eastern Australia Time | -14:00 |