| Willoughby Ifran | Western European Time | 10:00 |
| Willoughby Idlib | Eastern European Time | 09:00 |
| Willoughby Idukki Township | India Standard Time | 05:30 |
| Willoughby Idyllwild-Pine Cove | Pacific Time | 19:00 |
| Willoughby Ichikawa | Japan Time | 02:00 |
| Willoughby Idar | India Standard Time | 05:30 |
| Willoughby Idalia | Eastern Australia Time | 01:00 |
| Willoughby Illueca | Central European Time | 10:00 |
| Willoughby Ilavala Hobli | India Standard Time | 05:30 |
| Willoughby Ileret | East Africa Time | 08:00 |
| Willoughby Iligan City | Philippine Time | 03:00 |
| Willoughby Ilford | United Kingdom Time | 11:00 |
| Willoughby Ilfracombe | United Kingdom Time | 11:00 |
| Willoughby Ikšķile | Eastern European Time | 09:00 |
| Willoughby Humboldt | Central Time | 17:00 |
| Willoughby Hunter River | Atlantic Time | 15:00 |
| Willoughby Hulshout | Central European Time | 10:00 |
| Willoughby Hultsfred | Central European Time | 10:00 |
| Willoughby Hulu Langat | Malaysia Time | 03:00 |
| Willoughby Huixquilucan de Degollado | Central Time | 17:00 |
| Willoughby Hudson | Eastern Time | 16:00 |
| Willoughby Hudson Oaks | Central Time | 17:00 |
| Willoughby Hubali-Dharwad | India Standard Time | 05:30 |
| Willoughby Huez | Central European Time | 10:00 |
| Willoughby Hudsonville | Eastern Time | 16:00 |
| Willoughby Huehuetoca | Central Time | 17:00 |
| Willoughby Hyde Park | Eastern Australia Time | 01:00 |
| Willoughby Hyderabad | India Standard Time | 05:30 |
| Willoughby Hyderabad | India Standard Time | 05:30 |
| Willoughby Hyderabad | India Standard Time | 05:30 |
| Willoughby Hyderabad | India Standard Time | 05:30 |
| Willoughby Huntingdale | Western Australia Time | 03:00 |
| Willoughby Huttons Ambo | United Kingdom Time | 11:00 |
| Willoughby Huskisson | Eastern Australia Time | 00:00 |
| Willoughby Húsavík | Greenwich Mean Time | 11:00 |
| Willoughby Husborne Crawley | United Kingdom Time | 11:00 |
| Willoughby Hurstville | Eastern Australia Time | 00:00 |
| Willoughby Hurricane | Mountain Time | 18:00 |