| Greenwich Corte Madera | Pacific Time | 03:00 |
| Greenwich Costa da Caparica | Western European Time | -05:00 |
| Greenwich Costa d'en Blanes | Central European Time | -06:00 |
| Greenwich Cotati | Pacific Time | 03:00 |
| Greenwich Cosmopolis | Pacific Time | 03:00 |
| Greenwich Costa Teguise | Western European Time | -05:00 |
| Greenwich Chikusa Ward | Japan Time | -13:00 |
| Greenwich Capraia E Limite | Central European Time | -06:00 |
| Greenwich Capitol Heights | Eastern Time | 00:00 |
| Greenwich Capitola | Pacific Time | 03:00 |
| Greenwich Chester Hill | Eastern Australia Time | -14:00 |
| Greenwich Chester | Eastern Time | 00:00 |
| Greenwich Chesterland | Eastern Time | 00:00 |
| Greenwich Chestermere | Mountain Time | 02:00 |
| Greenwich Chesterton | Central Time | 01:00 |
| Greenwich Chestertown | Eastern Time | 00:00 |
| Greenwich Chianciano Terme | Central European Time | -06:00 |
| Greenwich Chiang Mai | Indochina Time | -11:00 |
| Greenwich Chicago | Central Time | 01:00 |
| Greenwich Cannon Air Force Base | Mountain Time | 02:00 |
| Greenwich Cannington | Western Australia Time | -12:00 |
| Greenwich Cannington | Eastern Time | 00:00 |
| Greenwich Cangey | Central European Time | -06:00 |
| Greenwich Canena | Central European Time | -06:00 |
| Greenwich Canfield | Eastern Time | 00:00 |
| Greenwich Canley Heights | Eastern Australia Time | -14:00 |
| Greenwich Canley Vale | Eastern Australia Time | -14:00 |
| Greenwich Canmore | Mountain Time | 02:00 |
| Greenwich Capileira | Central European Time | -06:00 |
| Greenwich Capilla del Monte | Argentina Time | -01:00 |
| Greenwich Cape Breton | Atlantic Time | -01:00 |
| Greenwich Cape Town | South Africa Standard Time | -06:00 |
| Greenwich Cape Town | South Africa Standard Time | -06:00 |
| Greenwich Capel Saint Mary | United Kingdom Time | -05:00 |
| Greenwich Capanne | Central European Time | -06:00 |
| Greenwich Caorle | Central European Time | -06:00 |
| Greenwich Canyonville | Pacific Time | 03:00 |
| Greenwich Canyon | Central Time | 01:00 |