| Siena Brakel | Central European Time | 00:00 |
| Siena Lauterbrunnen | Central European Time | 00:00 |
| Siena Grönland | Central European Time | 00:00 |
| Siena Kiota | West Africa Time | 01:00 |
| Siena Altona North | Eastern Australia Time | -08:00 |
| Siena Uran Islampur | India Standard Time | -03:30 |
| Siena Wetaskiwin | Mountain Time | 08:00 |
| Siena Pazhayangadi | India Standard Time | -03:30 |
| Siena Bramfield | United Kingdom Time | 01:00 |
| Siena Lavelanet | Central European Time | 00:00 |
| Siena Freiburg | Central European Time | 00:00 |
| Siena Kalamazoo Township | Eastern Time | 06:00 |
| Siena Adoor | India Standard Time | -03:30 |
| Siena Ursel | Central European Time | 00:00 |
| Siena Whitby | United Kingdom Time | 01:00 |
| Siena Poreč | Central European Time | 00:00 |
| Siena Bramley | United Kingdom Time | 01:00 |
| Siena Lava Hot Springs | Mountain Time | 08:00 |
| Siena Fresnedillas de la Oliva | Central European Time | 00:00 |
| Siena Kallam | India Standard Time | -03:30 |
| Siena Adpar | United Kingdom Time | 01:00 |
| Siena Urmar Tanda | India Standard Time | -03:30 |
| Siena Whitby | Eastern Time | 06:00 |
| Siena Port Antonio | Eastern Time | 07:00 |
| Siena Branchburg | Eastern Time | 06:00 |
| Siena Lavagno | Central European Time | 00:00 |
| Siena Frenchtown | Eastern Time | 06:00 |
| Siena Kall | Central European Time | 00:00 |
| Siena Altona | Eastern Australia Time | -08:00 |
| Siena Urizar | Central European Time | 00:00 |
| Siena Whitchurch | United Kingdom Time | 01:00 |
| Siena Port Adelaide | Central Australia Time | -07:30 |
| Siena Björna | Central European Time | 00:00 |
| Siena San Martín de Porres | Peru Time | 07:00 |
| Siena Fredonia | Eastern Time | 06:00 |
| Siena Kalaburagi | India Standard Time | -03:30 |
| Siena Ascot Vale | Eastern Australia Time | -08:00 |
| Siena Unterseen | Central European Time | 00:00 |
| Siena White City | Pacific Time | 09:00 |
| Siena Pornic | Central European Time | 00:00 |
| Siena Black River Falls | Central Time | 07:00 |
| Siena San Marcos La Laguna | Central Time | 08:00 |
| Siena Freeland | Eastern Time | 06:00 |
| Siena Kakkanad | India Standard Time | -03:30 |
| Siena Ascoli Satriano | Central European Time | 00:00 |
| Siena Unthank | United Kingdom Time | 01:00 |
| Siena White Hall | Central Time | 07:00 |
| Siena Pawleys Island | Eastern Time | 06:00 |
| Siena Bissone | Central European Time | 00:00 |
| Siena Saint Ann | Central Time | 07:00 |