| Old Basing Westmead | Eastern Australia Time | -09:00 |
| Old Basing West Windsor Township | Eastern Time | 05:00 |
| Old Basing Westborough | Eastern Time | 05:00 |
| Old Basing Wetzikon | Central European Time | -01:00 |
| Old Basing Wetherill Park | Eastern Australia Time | -09:00 |
| Old Basing Weston Subedge | United Kingdom Time | 00:00 |
| Old Basing Westville | South Africa Standard Time | -01:00 |
| Old Basing Wetaskiwin | Mountain Time | 07:00 |
| Old Basing Wexford | Ireland Time | 00:00 |
| Old Basing Wexford | Eastern Time | 05:00 |
| Old Basing Whalley | United Kingdom Time | 00:00 |
| Old Basing Whanganui | New Zealand Time | -11:00 |
| Old Basing Wheatley | Central Time | 06:00 |
| Old Basing Wheaton-Glenmont | Eastern Time | 05:00 |
| Old Basing Vilanova del Camí | Central European Time | -01:00 |
| Old Basing Vila Nova de Famalicão | Western European Time | 00:00 |
| Old Basing Vila Flores | Brasilia Time | 04:00 |
| Old Basing Vijapadi | India Standard Time | -04:30 |
| Old Basing Villa Nueva | Argentina Time | 04:00 |
| Old Basing Villa Giardino | Argentina Time | 04:00 |
| Old Basing Zermatt | Central European Time | -01:00 |
| Old Basing Zephyr | Eastern Time | 05:00 |
| Old Basing Zephyrhills | Eastern Time | 05:00 |
| Old Basing Zeven | Central European Time | -01:00 |
| Old Basing Zero Branco | Central European Time | -01:00 |
| Old Basing Whitby | United Kingdom Time | 00:00 |
| Old Basing Whitby | Eastern Time | 05:00 |
| Old Basing Whitchurch | United Kingdom Time | 00:00 |
| Old Basing White City | Pacific Time | 08:00 |
| Old Basing White Hall | Central Time | 06:00 |
| Old Basing White Lake charter Township | Eastern Time | 05:00 |
| Old Basing Zandhoven | Central European Time | -01:00 |
| Old Basing Whitefish | Mountain Time | 07:00 |
| Old Basing Whiteman Air Force Base | Central Time | 06:00 |
| Old Basing Whitesboro | Eastern Time | 05:00 |
| Old Basing Whiteville | Eastern Time | 05:00 |
| Old Basing Whitewater | Central Time | 06:00 |
| Old Basing Zanzibar Town | East Africa Time | -02:00 |