| Keystone Carmel-by-the-Sea | Pacific Time | 01:00 |
| Keystone Hammersbach | Central European Time | -08:00 |
| Keystone Carnforth | United Kingdom Time | -07:00 |
| Keystone Hammamet Sud | Central European Time | -07:00 |
| Keystone Carnac | Central European Time | -08:00 |
| Keystone Hammamet | Central European Time | -07:00 |
| Keystone Chippewa Falls | Central Time | -01:00 |
| Keystone Glis | Central European Time | -08:00 |
| Keystone Chipping Campden | United Kingdom Time | -07:00 |
| Keystone Glenorchy | Eastern Australia Time | -17:00 |
| Keystone Chipping Norton | Eastern Australia Time | -17:00 |
| Keystone Glenfield | Eastern Australia Time | -17:00 |
| Keystone Chinon | Central European Time | -08:00 |
| Keystone Glenside | Eastern Time | -02:00 |
| Keystone Caroline Springs | Eastern Australia Time | -17:00 |
| Keystone Glenunga | Central Australia Time | -16:30 |
| Keystone Carole Park | Eastern Australia Time | -16:00 |
| Keystone Glen Rock | Eastern Time | -02:00 |
| Keystone Carolina Beach | Eastern Time | -02:00 |
| Keystone Glen Waverley | Eastern Australia Time | -17:00 |
| Keystone Chilmark | Eastern Time | -02:00 |
| Keystone Glencoe | United Kingdom Time | -07:00 |
| Keystone Chiloquin | Pacific Time | 01:00 |
| Keystone Glendale | Eastern Australia Time | -17:00 |
| Keystone Chimney Rock | Eastern Time | -02:00 |
| Keystone Glen Huntly | Eastern Australia Time | -17:00 |
| Keystone Chimgan | Uzbekistan Time | -11:00 |
| Keystone Glenelg | Central Australia Time | -16:30 |
| Keystone Glendenning | Eastern Australia Time | -17:00 |
| Keystone Glendhu Bay | New Zealand Time | -19:00 |
| Keystone Cobh | Ireland Time | -07:00 |
| Keystone Cocoa Beach | Eastern Time | -02:00 |
| Keystone Coconut Grove | Central Australia Time | -15:30 |
| Keystone Clyde | Eastern Australia Time | -17:00 |
| Keystone Clyst Saint Mary | United Kingdom Time | -07:00 |
| Keystone Coalinga | Pacific Time | 01:00 |
| Keystone Coacalco de Berriozabal | Central Time | 00:00 |
| Keystone Dapto | Eastern Australia Time | -17:00 |
| Keystone Dardanelle | Central Time | -01:00 |
| Keystone Darlinghurst | Eastern Australia Time | -17:00 |
| Keystone Darch | Western Australia Time | -14:00 |
| Keystone Darasaguppe | India Standard Time | -11:30 |
| Keystone Dartmouth | Eastern Time | -02:00 |
| Keystone Darwin City | Central Australia Time | -15:30 |
| Keystone Darlington | Eastern Australia Time | -17:00 |
| Keystone Dartington | United Kingdom Time | -07:00 |
| Keystone Davidson | Eastern Time | -02:00 |
| Keystone David | Eastern Time | -01:00 |
| Keystone David City | Central Time | -01:00 |
| Keystone Davangere | India Standard Time | -11:30 |