| West Perth Sancerre | Central European Time | 06:00 |
| West Perth San Vito al Tagliamento | Central European Time | 06:00 |
| West Perth San Vito Lo Capo | Central European Time | 06:00 |
| West Perth Sandy Bay | Eastern Australia Time | -02:00 |
| West Perth Seaton Ross | United Kingdom Time | 07:00 |
| West Perth Seattle | Pacific Time | 15:00 |
| West Perth Searsport | Eastern Time | 12:00 |
| West Perth Sand City | Pacific Time | 15:00 |
| West Perth Sandgate | Eastern Australia Time | -02:00 |
| West Perth Seebara | India Standard Time | 02:30 |
| West Perth Seekonk | Eastern Time | 12:00 |
| West Perth Seeley's Bay | Eastern Time | 12:00 |
| West Perth Seelow | Central European Time | 06:00 |
| West Perth Sedona | Mountain Time | 15:00 |
| West Perth Sedro-Woolley | Pacific Time | 15:00 |
| West Perth Seeb | Gulf Standard Time | 04:00 |
| West Perth Sedbergh | United Kingdom Time | 07:00 |
| West Perth Sechelt | Pacific Time | 15:00 |
| West Perth Sebree | Central Time | 13:00 |
| West Perth Sebring | Eastern Time | 12:00 |
| West Perth Šebrov-Kateřina | Central European Time | 06:00 |
| West Perth Sebastopol | Pacific Time | 15:00 |
| West Perth Seberang Jaya | Malaysia Time | 00:00 |
| West Perth Seberang Perai | Malaysia Time | 00:00 |
| West Perth Zillah | Pacific Time | 15:00 |
| West Perth Zirakpur | India Standard Time | 02:30 |
| West Perth Zofingen | Central European Time | 06:00 |
| West Perth Zollikerberg | Central European Time | 06:00 |
| West Perth Xaxim | Brasilia Time | 11:00 |
| West Perth Wythall | United Kingdom Time | 07:00 |
| West Perth Wytheville | Eastern Time | 12:00 |
| West Perth Xaafuun | East Africa Time | 05:00 |
| West Perth Xàbia | Central European Time | 06:00 |
| West Perth Xalapa | Central Time | 13:00 |
| West Perth Xalapa Enríquez | Central Time | 13:00 |
| West Perth Xalisco | Mexican Pacific Time | 14:00 |
| West Perth Zikhron Ya'akov | Israel Time | 05:00 |
| West Perth Zhongshan | China Time | 00:00 |