| Siena Luanda | West Africa Time | 00:00 |
| Siena Quezon City | Philippine Time | -07:00 |
| Siena Addis Ababa | East Africa Time | -02:00 |
| Siena Nairobi | East Africa Time | -02:00 |
| Siena Chicago | Central Time | 06:00 |
| Siena Salvador | Brasilia Time | 04:00 |
| Siena Jaipur | India Standard Time | -04:30 |
| Siena Dar es Salaam | East Africa Time | -02:00 |
| Siena Lanzhou | China Time | -07:00 |
| Siena Incheon | Korean Time | -08:00 |
| Siena Yunfu | China Time | -07:00 |
| Siena Navi Mumbai | India Standard Time | -04:30 |
| Siena Basrah | Arabian Time | -02:00 |
| Siena Toronto | Eastern Time | 05:00 |
| Siena Osaka | Japan Time | -08:00 |
| Siena Mogadishu | East Africa Time | -02:00 |
| Siena Daegu | Korean Time | -08:00 |
| Siena Faisalabad | Pakistan Time | -04:00 |
| Siena Izmir | Turkey Time | -02:00 |
| Siena Dakar | Greenwich Mean Time | 01:00 |
| Siena Lucknow | India Standard Time | -04:30 |
| Siena Giza | Eastern European Time | -01:00 |
| Siena Fortaleza | Brasilia Time | 04:00 |
| Siena Cali | Colombia Time | 06:00 |
| Siena Surabaya | Western Indonesia Time | -06:00 |
| Siena Belo Horizonte | Brasilia Time | 04:00 |
| Siena Nanchang | China Time | -07:00 |
| Siena Rome | Central European Time | 00:00 |
| Siena Mashhad | Iran Time | -03:30 |
| Siena Borough of Brooklyn | Eastern Time | 05:00 |
| Siena Houston | Central Time | 06:00 |
| Siena Queens | Eastern Time | 05:00 |
| Siena Nagpur | India Standard Time | -04:30 |
| Siena Maracaibo | Venezuela Time | 05:00 |
| Siena Brasília | Brasilia Time | 04:00 |
| Siena Santo Domingo | Atlantic Time | 05:00 |
| Siena Nagoya | Japan Time | -08:00 |
| Siena Brisbane | Eastern Australia Time | -09:00 |
| Siena Havana | Cuba Time | 05:00 |
| Siena Paris | Central European Time | 00:00 |
| Siena Al Mawşil al Jadīdah | Arabian Time | -02:00 |
| Siena Johannesburg | South Africa Standard Time | -01:00 |
| Siena Kowloon | Hong Kong Time | -07:00 |
| Siena Al Başrah al Qadīmah | Arabian Time | -02:00 |
| Siena Almaty | East Kazakhstan Time | -05:00 |
| Siena Medellin | Colombia Time | 06:00 |
| Siena Tashkent | Uzbekistan Time | -04:00 |
| Siena Algiers | Central European Time | 00:00 |
| Siena Khartoum | Central Africa Time | -01:00 |
| Siena Accra | Greenwich Mean Time | 01:00 |