| Siena Golling an der Salzach | Central European Time | 00:00 |
| Siena Kayathar | India Standard Time | -03:30 |
| Siena Bad Bramstedt | Central European Time | 00:00 |
| Siena Morley | Western Australia Time | -06:00 |
| Siena España la Vieja | Central European Time | 00:00 |
| Siena Muntinlupa | Philippine Time | -06:00 |
| Siena Port Klang | Malaysia Time | -06:00 |
| Siena San Andrés Cholula | Central Time | 07:00 |
| Siena Goldthwaite | Central Time | 07:00 |
| Siena Nakahara Ward | Japan Time | -07:00 |
| Siena Bad Breisig | Central European Time | 00:00 |
| Siena Mormoiron | Central European Time | 00:00 |
| Siena Española | Mountain Time | 08:00 |
| Siena Munxar | Central European Time | 00:00 |
| Siena Port Elliot | Central Australia Time | -07:30 |
| Siena San Andrés Cholula | Central Time | 07:00 |
| Siena Gold Hill | Pacific Time | 09:00 |
| Siena Kawartha Lakes | Eastern Time | 06:00 |
| Siena Bad Brückenau | Central European Time | 00:00 |
| Siena Morningside | Eastern Australia Time | -08:00 |
| Siena Dublin | Pacific Time | 09:00 |
| Siena Munxar | Central European Time | 00:00 |
| Siena Port Fairy | Eastern Australia Time | -08:00 |
| Siena Roleystone | Western Australia Time | -06:00 |
| Siena Goldau | Central European Time | 00:00 |
| Siena Kawarau Falls | New Zealand Time | -10:00 |
| Siena Bad Buchau | Central European Time | 00:00 |
| Siena Minerva | Eastern Time | 06:00 |
| Siena Dublin | Ireland Time | 01:00 |
| Siena Mur-de-Sologne | Central European Time | 00:00 |
| Siena Port Dover | Eastern Time | 06:00 |
| Siena Samana | Atlantic Time | 06:00 |
| Siena Golub-Dobrzyń | Central European Time | 00:00 |
| Siena Kayamkulam | India Standard Time | -03:30 |
| Siena Bay Minette | Central Time | 07:00 |
| Siena Montville | Eastern Australia Time | -08:00 |
| Siena Dublin | Ireland Time | 01:00 |
| Siena Münstertal | Central European Time | 00:00 |
| Siena Port de Pollença | Central European Time | 00:00 |
| Siena Sámara | Central Time | 08:00 |
| Siena Mandrem | India Standard Time | -03:30 |
| Siena Harfleur | Central European Time | 00:00 |
| Siena Bad Wörishofen | Central European Time | 00:00 |
| Siena Montville | Eastern Time | 06:00 |
| Siena Dublin | Ireland Time | 01:00 |
| Siena Münsingen | Central European Time | 00:00 |
| Siena Pool | United Kingdom Time | 01:00 |
| Siena Shorewood | Central Time | 07:00 |
| Siena Mandeville | Central Time | 07:00 |
| Siena Hardys Bay | Eastern Australia Time | -08:00 |