| Siena Arkula | India Standard Time | -04:30 |
| Siena Healdsburg | Pacific Time | 08:00 |
| Siena Wahroonga | Eastern Australia Time | -10:00 |
| Siena Ilavala Hobli | India Standard Time | -04:30 |
| Siena Arlesheim | Central European Time | 00:00 |
| Siena Hayden | Pacific Time | 08:00 |
| Siena Waikanae | New Zealand Time | -12:00 |
| Siena Ikšķile | Eastern European Time | -01:00 |
| Siena Waghunde Kh. | India Standard Time | -04:30 |
| Siena Haymarket | Eastern Australia Time | -10:00 |
| Siena Wagoner | Central Time | 06:00 |
| Siena Johns Island | Eastern Time | 05:00 |
| Siena Wagrain | Central European Time | 00:00 |
| Siena Haymarket | Eastern Time | 05:00 |
| Siena Waimanalo | Hawaii-Aleutian Time | 11:00 |
| Siena Jojutla de Juárez | Central Time | 07:00 |
| Siena Waimauku | New Zealand Time | -12:00 |
| Siena Hawthorn | Eastern Australia Time | -10:00 |
| Siena Waite Park | Central Time | 06:00 |
| Siena Jonesborough | Eastern Time | 05:00 |
| Siena Waitomo | New Zealand Time | -12:00 |
| Siena Hawthorn East | Eastern Australia Time | -10:00 |
| Siena Waitsfield | Eastern Time | 05:00 |
| Siena Jonestown | Central Time | 06:00 |
| Siena Wakefield | Eastern Time | 05:00 |
| Siena Graikas | Eastern European Time | -01:00 |
| Siena Wakan | Gulf Standard Time | -03:00 |
| Siena Jonesville | Eastern Time | 05:00 |
| Siena Zandhoven | Central European Time | 00:00 |
| Siena Goxhill | United Kingdom Time | 01:00 |
| Siena Walchwil | Central European Time | 00:00 |
| Siena Imboden | Central Time | 06:00 |
| Siena Zermatt | Central European Time | 00:00 |
| Siena Govone | Central European Time | 00:00 |
| Siena Zephyr | Eastern Time | 05:00 |
| Siena Immenstadt | Central European Time | 00:00 |
| Siena Zephyrhills | Eastern Time | 05:00 |
| Siena Grafton | Central Time | 06:00 |
| Siena Zeven | Central European Time | 00:00 |
| Siena Kelantan | Western Indonesia Time | -06:00 |
| Siena Zero Branco | Central European Time | 00:00 |
| Siena Gräfenhainichen | Central European Time | 00:00 |
| Siena Zanzibar Town | East Africa Time | -02:00 |
| Siena Kelawade | India Standard Time | -04:30 |
| Siena Grafschaft | Central European Time | 00:00 |
| Siena Keeranur | India Standard Time | -04:30 |
| Siena Grafton | Eastern Australia Time | -10:00 |
| Siena Kebili | West Africa Time | 00:00 |
| Siena Gramado | Brasilia Time | 04:00 |
| Siena København | Central European Time | 00:00 |