| Gatchina Jhikli Ambwari | India Standard Time | -02:30 |
| Gatchina Jessup | Eastern Time | 08:00 |
| Gatchina Jesus Maria | Peru Time | 08:00 |
| Gatchina Jette | Central European Time | 02:00 |
| Gatchina Jettingen-Scheppach | Central European Time | 02:00 |
| Gatchina Jindalee | Eastern Australia Time | -07:00 |
| Gatchina Jindivick | Eastern Australia Time | -08:00 |
| Gatchina Jim Thorpe | Eastern Time | 08:00 |
| Gatchina Jinan | China Time | -05:00 |
| Gatchina Ironton | Eastern Time | 08:00 |
| Gatchina Iruma | Japan Time | -06:00 |
| Gatchina Ireland | United Kingdom Time | 03:00 |
| Gatchina Ipswich | Eastern Time | 08:00 |
| Gatchina Iowa Park | Central Time | 09:00 |
| Gatchina Iphofen | Central European Time | 02:00 |
| Gatchina Inzell | Central European Time | 02:00 |
| Gatchina Inverurie | United Kingdom Time | 03:00 |
| Gatchina Inverleigh | Eastern Australia Time | -08:00 |
| Gatchina Innaloo | Western Australia Time | -05:00 |
| Gatchina Intra | Central European Time | 02:00 |
| Gatchina Ingersoll | Eastern Time | 08:00 |
| Gatchina Ingleburn | Eastern Australia Time | -08:00 |
| Gatchina Inez | Eastern Time | 08:00 |
| Gatchina Inishmore | Ireland Time | 03:00 |
| Gatchina Indapur | India Standard Time | -02:30 |
| Gatchina Indiana | Eastern Time | 08:00 |
| Gatchina Indialantic | Eastern Time | 08:00 |
| Gatchina Indian Harbour Beach | Eastern Time | 08:00 |
| Gatchina Indian Rocks Beach | Eastern Time | 08:00 |
| Gatchina Imboden | Central Time | 09:00 |
| Gatchina Immenstadt | Central European Time | 02:00 |
| Gatchina Incline Village | Pacific Time | 11:00 |
| Gatchina Inala | Eastern Australia Time | -07:00 |
| Gatchina Inari | Eastern European Time | 01:00 |
| Gatchina Ischgl | Central European Time | 02:00 |
| Gatchina Irvine | Pacific Time | 11:00 |
| Gatchina Irvine | United Kingdom Time | 03:00 |
| Gatchina Irving | Central Time | 09:00 |
| Gatchina Ishikawa | Japan Time | -06:00 |
| Gatchina Issigeac | Central European Time | 02:00 |
| Gatchina Islington | Eastern Australia Time | -08:00 |
| Gatchina Islamorada | Eastern Time | 08:00 |
| Gatchina Islamabad | Pakistan Time | -02:00 |
| Gatchina Islandia | Eastern Time | 08:00 |
| Gatchina Isle | Central Time | 09:00 |
| Gatchina Isla Canela | Central European Time | 02:00 |
| Gatchina Isla Mujeres | Eastern Time | 08:00 |
| Gatchina Itabashi | Japan Time | -06:00 |
| Gatchina Itatiaia | Brasilia Time | 06:00 |
| Gatchina Itaunja | India Standard Time | -02:30 |