| Diamond Bar Willoughby | Eastern Australia Time | -17:00 |
| Diamond Bar Willows | Pacific Time | 00:00 |
| Diamond Bar Willunga | Central Australia Time | -16:30 |
| Diamond Bar Willisau | Central European Time | -09:00 |
| Diamond Bar Williston Park | Eastern Time | -03:00 |
| Diamond Bar Willits | Pacific Time | 00:00 |
| Diamond Bar Zanzibar Town | East Africa Time | -10:00 |
| Diamond Bar Winchester | Eastern Time | -03:00 |
| Diamond Bar Zandhoven | Central European Time | -09:00 |
| Diamond Bar Williamstown | Eastern Time | -03:00 |
| Diamond Bar Williamsville | Eastern Time | -03:00 |
| Diamond Bar Williamstown | Eastern Australia Time | -17:00 |
| Diamond Bar Williams | Mountain Time | 00:00 |
| Diamond Bar Williamsburg | Eastern Time | -03:00 |
| Diamond Bar Willaston | United Kingdom Time | -08:00 |
| Diamond Bar Wilkesboro | Eastern Time | -03:00 |
| Diamond Bar Wilkau-Haßlau | Central European Time | -09:00 |
| Diamond Bar Wilbraham | Eastern Time | -03:00 |
| Diamond Bar Wildau | Central European Time | -09:00 |
| Diamond Bar Wilder | Eastern Time | -03:00 |
| Diamond Bar Wilderswil | Central European Time | -09:00 |
| Diamond Bar Wiesbaden | Central European Time | -09:00 |
| Diamond Bar Wieselburg | Central European Time | -09:00 |
| Diamond Bar Wildwood | Eastern Time | -03:00 |
| Diamond Bar Wickham | United Kingdom Time | -08:00 |
| Diamond Bar Wickham Bishops | United Kingdom Time | -08:00 |
| Diamond Bar Wicklow | Ireland Time | -08:00 |
| Diamond Bar Widnau | Central European Time | -09:00 |
| Diamond Bar Whitney | Central Time | -02:00 |
| Diamond Bar Vicente López | Argentina Time | -04:00 |
| Diamond Bar Victoria | Central European Time | -09:00 |
| Diamond Bar Victoria Park | Western Australia Time | -15:00 |
| Diamond Bar Victoria Point | Eastern Australia Time | -17:00 |
| Diamond Bar Zephyr | Eastern Time | -03:00 |
| Diamond Bar Zephyrhills | Eastern Time | -03:00 |
| Diamond Bar Zermatt | Central European Time | -09:00 |
| Diamond Bar Zero Branco | Central European Time | -09:00 |
| Diamond Bar Zeven | Central European Time | -09:00 |