| Siena Vinnytsia | Eastern European Time | -01:00 |
| Siena Apodaca | Central Time | 08:00 |
| Siena Anshun | China Time | -06:00 |
| Siena Suita | Japan Time | -07:00 |
| Siena Ixtapaluca | Central Time | 08:00 |
| Siena Wakayama | Japan Time | -07:00 |
| Siena Anaheim | Pacific Time | 09:00 |
| Siena Hualien City | Taipei Time | -06:00 |
| Siena Lapu-Lapu City | Philippine Time | -06:00 |
| Siena Punasa | India Standard Time | -03:30 |
| Siena Diepsloot | South Africa Standard Time | 00:00 |
| Siena Muzaffarnagar | India Standard Time | -03:30 |
| Siena Nuevo Laredo | Central Time | 07:00 |
| Siena Florence | Central European Time | 00:00 |
| Siena Sanandaj | Iran Time | -02:30 |
| Siena Latur | India Standard Time | -03:30 |
| Siena Campina Grande | Brasilia Time | 05:00 |
| Siena Etobicoke | Eastern Time | 06:00 |
| Siena Camaguey | Cuba Time | 06:00 |
| Siena London | Eastern Time | 06:00 |
| Siena Chifeng | China Time | -06:00 |
| Siena Hŭngnam | Pyongyang Time | -07:00 |
| Siena Astana | East Kazakhstan Time | -04:00 |
| Siena Belgorod | Moscow Time | -01:00 |
| Siena Kosti | Central Africa Time | 00:00 |
| Siena Taihecun | China Time | -06:00 |
| Siena Doha | Arabian Time | -01:00 |
| Siena Turmero | Venezuela Time | 06:00 |
| Siena Tláhuac | Central Time | 08:00 |
| Siena Cuernavaca | Central Time | 08:00 |
| Siena Kurgan | Yekaterinburg Time | -03:00 |
| Siena Rangpur | Bangladesh Time | -04:00 |
| Siena Bhimbar | Pakistan Time | -03:00 |
| Siena Vitsyebsk | Moscow Time | -01:00 |
| Siena Soledad | Colombia Time | 07:00 |
| Siena Shiqi | China Time | -06:00 |
| Siena Piracicaba | Brasilia Time | 05:00 |
| Siena Zürich | Central European Time | 00:00 |
| Siena Kūkatpalli | India Standard Time | -03:30 |
| Siena Jhang Sadar | Pakistan Time | -03:00 |
| Siena Arusha | East Africa Time | -01:00 |
| Siena Ambattur | India Standard Time | -03:30 |
| Siena Koriyama | Japan Time | -07:00 |
| Siena Plovdiv | Eastern European Time | -01:00 |
| Siena Chitungwiza | Central Africa Time | 00:00 |
| Siena Kashiwa | Japan Time | -07:00 |
| Siena Latakia | Eastern European Time | -01:00 |
| Siena Aksu | China Time | -06:00 |
| Siena Irapuato | Central Time | 08:00 |
| Siena Tokorozawa | Japan Time | -07:00 |