| Otaru Xuchang | China Time | 01:00 |
| Otaru Willaston | United Kingdom Time | 08:00 |
| Otaru Xuzhou | China Time | 01:00 |
| Otaru Williams | Mountain Time | 16:00 |
| Otaru Yaliyuru | India Standard Time | 03:30 |
| Otaru Williamsburg | Eastern Time | 13:00 |
| Otaru Yallabatharra | Western Australia Time | 01:00 |
| Otaru Wilbraham | Eastern Time | 13:00 |
| Otaru Yallambie | Eastern Australia Time | -01:00 |
| Otaru Wildau | Central European Time | 07:00 |
| Otaru Zuidhorn | Central European Time | 07:00 |
| Otaru Wilder | Eastern Time | 13:00 |
| Otaru Zuidoostbeemster | Central European Time | 07:00 |
| Otaru Wilderswil | Central European Time | 07:00 |
| Otaru Zugliano | Central European Time | 07:00 |
| Otaru Wildwood | Eastern Time | 13:00 |
| Otaru Zoutelande | Central European Time | 07:00 |
| Otaru Wilkau-Haßlau | Central European Time | 07:00 |
| Otaru Zürs | Central European Time | 07:00 |
| Otaru Wilkesboro | Eastern Time | 13:00 |
| Otaru Zwingenberg | Central European Time | 07:00 |
| Otaru Wiesbaden | Central European Time | 07:00 |
| Otaru Zweisimmen | Central European Time | 07:00 |
| Otaru Wieselburg | Central European Time | 07:00 |
| Otaru Zwiefalten | Central European Time | 07:00 |
| Otaru Wickham | United Kingdom Time | 08:00 |
| Otaru Wickham Bishops | United Kingdom Time | 08:00 |
| Otaru Wicklow | Ireland Time | 08:00 |
| Otaru Widnau | Central European Time | 07:00 |
| Otaru Victoria Point | Eastern Australia Time | -01:00 |
| Otaru Victoria | Central European Time | 07:00 |
| Otaru Victoria Park | Western Australia Time | 01:00 |
| Otaru Whitney | Central Time | 14:00 |
| Otaru Zillah | Pacific Time | 16:00 |
| Otaru Zirakpur | India Standard Time | 03:30 |
| Otaru Zikhron Ya'akov | Israel Time | 06:00 |
| Otaru Zollikerberg | Central European Time | 07:00 |
| Otaru Zofingen | Central European Time | 07:00 |