| Whitby Jhikli Ambwari | India Standard Time | -05:30 |
| Whitby Jessup | Eastern Time | 05:00 |
| Whitby Jesus Maria | Peru Time | 05:00 |
| Whitby Jette | Central European Time | -01:00 |
| Whitby Jettingen-Scheppach | Central European Time | -01:00 |
| Whitby Jindalee | Eastern Australia Time | -10:00 |
| Whitby Jindivick | Eastern Australia Time | -11:00 |
| Whitby Jim Thorpe | Eastern Time | 05:00 |
| Whitby Jinan | China Time | -08:00 |
| Whitby Ironton | Eastern Time | 05:00 |
| Whitby Iruma | Japan Time | -09:00 |
| Whitby Ireland | United Kingdom Time | 00:00 |
| Whitby Ipswich | Eastern Time | 05:00 |
| Whitby Iowa Park | Central Time | 06:00 |
| Whitby Iphofen | Central European Time | -01:00 |
| Whitby Inzell | Central European Time | -01:00 |
| Whitby Inverurie | United Kingdom Time | 00:00 |
| Whitby Inverleigh | Eastern Australia Time | -11:00 |
| Whitby Innaloo | Western Australia Time | -08:00 |
| Whitby Intra | Central European Time | -01:00 |
| Whitby Ingersoll | Eastern Time | 05:00 |
| Whitby Ingleburn | Eastern Australia Time | -11:00 |
| Whitby Inez | Eastern Time | 05:00 |
| Whitby Inishmore | Ireland Time | 00:00 |
| Whitby Indapur | India Standard Time | -05:30 |
| Whitby Indiana | Eastern Time | 05:00 |
| Whitby Indialantic | Eastern Time | 05:00 |
| Whitby Indian Harbour Beach | Eastern Time | 05:00 |
| Whitby Indian Rocks Beach | Eastern Time | 05:00 |
| Whitby Imboden | Central Time | 06:00 |
| Whitby Immenstadt | Central European Time | -01:00 |
| Whitby Incline Village | Pacific Time | 08:00 |
| Whitby Inala | Eastern Australia Time | -10:00 |
| Whitby Inari | Eastern European Time | -02:00 |
| Whitby Ischgl | Central European Time | -01:00 |
| Whitby Irvine | Pacific Time | 08:00 |
| Whitby Irvine | United Kingdom Time | 00:00 |
| Whitby Irving | Central Time | 06:00 |
| Whitby Ishikawa | Japan Time | -09:00 |
| Whitby Issigeac | Central European Time | -01:00 |
| Whitby Islington | Eastern Australia Time | -11:00 |
| Whitby Islamorada | Eastern Time | 05:00 |
| Whitby Islamabad | Pakistan Time | -05:00 |
| Whitby Islandia | Eastern Time | 05:00 |
| Whitby Isle | Central Time | 06:00 |
| Whitby Isla Canela | Central European Time | -01:00 |
| Whitby Isla Mujeres | Eastern Time | 05:00 |
| Whitby Itabashi | Japan Time | -09:00 |
| Whitby Itatiaia | Brasilia Time | 03:00 |
| Whitby Itaunja | India Standard Time | -05:30 |