| Siena Muzaffarabad | Pakistan Time | -03:00 |
| Siena Guadalupe | Central Time | 08:00 |
| Siena Bağcılar | Turkey Time | -01:00 |
| Siena Sulaymaniyah | Arabian Time | -01:00 |
| Siena Cúcuta | Colombia Time | 07:00 |
| Siena Moradabad | India Standard Time | -03:30 |
| Siena N'Djamena | West Africa Time | 01:00 |
| Siena Langfang | China Time | -06:00 |
| Siena Zhumadian | China Time | -06:00 |
| Siena Yantai | China Time | -06:00 |
| Siena Lviv | Eastern European Time | -01:00 |
| Siena Merida | Central Time | 08:00 |
| Siena Tlalnepantla | Central Time | 08:00 |
| Siena Edmonton | Mountain Time | 08:00 |
| Siena Jeonju-si | Korean Time | -07:00 |
| Siena Zhuzhou | China Time | -06:00 |
| Siena Subang Jaya | Malaysia Time | -06:00 |
| Siena Bhiwandi | India Standard Time | -03:30 |
| Siena Pekanbaru | Western Indonesia Time | -05:00 |
| Siena Seville | Central European Time | 00:00 |
| Siena Tolyatti | Samara Time | -02:00 |
| Siena Jaboatão | Brasilia Time | 05:00 |
| Siena Shizuoka | Japan Time | -07:00 |
| Siena Santo Domingo Oeste | Atlantic Time | 06:00 |
| Siena Rajshahi | Bangladesh Time | -04:00 |
| Siena City of Balikpapan | Central Indonesia Time | -06:00 |
| Siena Changzhi | China Time | -06:00 |
| Siena Bulawayo | Central Africa Time | 00:00 |
| Siena Zagreb | Central European Time | 00:00 |
| Siena Agadir | Western European Time | 02:00 |
| Siena Sarajevo | Central European Time | 00:00 |
| Siena La Plata | Argentina Time | 05:00 |
| Siena Tunis | Central European Time | 01:00 |
| Siena Zhangjiakou | China Time | -06:00 |
| Siena Zigong | China Time | -06:00 |
| Siena Fuxin | China Time | -06:00 |
| Siena Enugu | West Africa Time | 01:00 |
| Siena Tangier | Western European Time | 02:00 |
| Siena Huangshi | China Time | -06:00 |
| Siena Liaoyang | China Time | -06:00 |
| Siena Sheffield | United Kingdom Time | 01:00 |
| Siena Seattle | Pacific Time | 09:00 |
| Siena Denver | Mountain Time | 08:00 |
| Siena El Paso | Mountain Time | 08:00 |
| Siena Kumamoto | Japan Time | -07:00 |
| Siena Raipur | India Standard Time | -03:30 |
| Siena General Santos | Philippine Time | -06:00 |
| Siena Dushanbe | Tajikistan Time | -03:00 |
| Siena Osasco | Brasilia Time | 05:00 |
| Siena San Luis Potosi | Central Time | 08:00 |