| Ostrava Sankt Blasien | Central European Time | 00:00 |
| Ostrava Whiteman Air Force Base | Central Time | 07:00 |
| Ostrava Sankt Ibb | Central European Time | 00:00 |
| Ostrava Whitesboro | Eastern Time | 06:00 |
| Ostrava Sângeorgiu de Mureș | Eastern European Time | -01:00 |
| Ostrava Whiteville | Eastern Time | 06:00 |
| Ostrava Saint Lucia | Eastern Australia Time | -08:00 |
| Ostrava Whitewater | Central Time | 07:00 |
| Ostrava Saint-Martin-de-Belleville | Central European Time | 00:00 |
| Ostrava Wetzikon | Central European Time | 00:00 |
| Ostrava Saint-Marcel-Campes | Central European Time | 00:00 |
| Ostrava Wexford | Ireland Time | 01:00 |
| Ostrava Saint Margrethen | Central European Time | 00:00 |
| Ostrava Weston Subedge | United Kingdom Time | 01:00 |
| Ostrava Saint Julian's | Central European Time | 00:00 |
| Ostrava Westville | South Africa Standard Time | 00:00 |
| Ostrava Saint-Just-Saint-Rambert | Central European Time | 00:00 |
| Ostrava Wetaskiwin | Mountain Time | 08:00 |
| Ostrava Saint-Leonard | Eastern Time | 06:00 |
| Ostrava Whalley | United Kingdom Time | 01:00 |
| Ostrava Saint Leonards | Eastern Australia Time | -08:00 |
| Ostrava Whanganui | New Zealand Time | -10:00 |
| Ostrava Saint Leonards | United Kingdom Time | 01:00 |
| Ostrava Wexford | Eastern Time | 06:00 |
| Ostrava Saint-Jean-de-l'Île-d'Orléans | Eastern Time | 06:00 |
| Ostrava Wetherill Park | Eastern Australia Time | -08:00 |
| Ostrava Saint-Jean-de-Luz | Central European Time | 00:00 |
| Ostrava Wheatley | Central Time | 07:00 |
| Ostrava Saint Ives | United Kingdom Time | 01:00 |
| Ostrava Wheaton-Glenmont | Eastern Time | 06:00 |
| Ostrava Saint James | Western Australia Time | -06:00 |
| Ostrava Zahara de los Atunes | Central European Time | 00:00 |
| Ostrava Saint James City | Eastern Time | 06:00 |
| Ostrava Saint-Jean-Cap-Ferrat | Central European Time | 00:00 |
| Ostrava Saint Johns | Eastern Time | 06:00 |
| Ostrava Saint-Joseph-de-Beauce | Eastern Time | 06:00 |
| Ostrava Saint-Joseph-du-Lac | Eastern Time | 06:00 |
| Ostrava Saint John | Central Time | 07:00 |