| Siwa Oasis Saint-Sylvain-d'Anjou | Central European Time | 00:00 |
| Siwa Oasis Saint Thomas | Central Time | 07:00 |
| Siwa Oasis Saint-Thomas | Eastern Time | 06:00 |
| Siwa Oasis Saint-Rémy | Central European Time | 00:00 |
| Siwa Oasis Saint-Rémy-de-Provence | Central European Time | 00:00 |
| Siwa Oasis Saint Robert | Central Time | 07:00 |
| Siwa Oasis Saint-Sauveur | Eastern Time | 06:00 |
| Siwa Oasis Sainte-Maxime | Central European Time | 00:00 |
| Siwa Oasis Santa María Huatulco | Central Time | 07:00 |
| Siwa Oasis Santa Nella | Pacific Time | 09:00 |
| Siwa Oasis Santa Oliva | Central European Time | 00:00 |
| Siwa Oasis Santa Ponça | Central European Time | 00:00 |
| Siwa Oasis Santa Maria A Vico | Central European Time | 00:00 |
| Siwa Oasis Sennfeld | Central European Time | 00:00 |
| Siwa Oasis Senden | Central European Time | 00:00 |
| Siwa Oasis Sendra | India Standard Time | -03:30 |
| Siwa Oasis Senegal | Peru Time | 07:00 |
| Siwa Oasis Sengurichi | India Standard Time | -03:30 |
| Siwa Oasis Santa Rosa Beach | Central Time | 07:00 |
| Siwa Oasis Solana Beach | Pacific Time | 09:00 |
| Siwa Oasis Sokali | India Standard Time | -03:30 |
| Siwa Oasis Sodus | Eastern Time | 06:00 |
| Siwa Oasis Sodus Point | Eastern Time | 06:00 |
| Siwa Oasis Sohar | Gulf Standard Time | -02:00 |
| Siwa Oasis Soběslav | Central European Time | 00:00 |
| Siwa Oasis Seseña Nuevo | Central European Time | 00:00 |
| Siwa Oasis Snoqualmie | Pacific Time | 09:00 |
| Siwa Oasis Setagaya | Japan Time | -07:00 |
| Siwa Oasis Serranópolis | Brasilia Time | 05:00 |
| Siwa Oasis Serdang | Malaysia Time | -06:00 |
| Siwa Oasis Seri Gading | Malaysia Time | -06:00 |
| Siwa Oasis Seri Kembangan | Malaysia Time | -06:00 |
| Siwa Oasis Seri Manjung | Malaysia Time | -06:00 |
| Siwa Oasis Sequim | Pacific Time | 09:00 |
| Siwa Oasis Seoul | Korean Time | -07:00 |
| Siwa Oasis Seoul | Korean Time | -07:00 |
| Siwa Oasis Sepang | Malaysia Time | -06:00 |
| Siwa Oasis Sepang | Malaysia Time | -06:00 |