| Hanoi Court-St.-Etienne | Central European Time | 05:00 |
| Hanoi Courmayeur | Central European Time | 05:00 |
| Hanoi Coulter | United Kingdom Time | 06:00 |
| Hanoi Cottonwood | Mountain Time | 14:00 |
| Hanoi Covington | Central Time | 12:00 |
| Hanoi Cowaramup | Western Australia Time | -01:00 |
| Hanoi Cozumel | Eastern Time | 12:00 |
| Hanoi Chilmark | Eastern Time | 11:00 |
| Hanoi Chiloquin | Pacific Time | 14:00 |
| Hanoi Chimney Rock | Eastern Time | 11:00 |
| Hanoi Chimgan | Uzbekistan Time | 02:00 |
| Hanoi Cape Town | South Africa Standard Time | 05:00 |
| Hanoi Cape Town | South Africa Standard Time | 05:00 |
| Hanoi Capel Saint Mary | United Kingdom Time | 06:00 |
| Hanoi Capileira | Central European Time | 05:00 |
| Hanoi Capilla del Monte | Argentina Time | 10:00 |
| Hanoi Capitol Heights | Eastern Time | 11:00 |
| Hanoi Capitola | Pacific Time | 14:00 |
| Hanoi Capraia E Limite | Central European Time | 05:00 |
| Hanoi Chippewa Falls | Central Time | 12:00 |
| Hanoi Chipping Campden | United Kingdom Time | 06:00 |
| Hanoi Chipping Norton | Eastern Australia Time | -03:00 |
| Hanoi Chinon | Central European Time | 05:00 |
| Hanoi Canyonville | Pacific Time | 14:00 |
| Hanoi Canyon | Central Time | 12:00 |
| Hanoi Caorle | Central European Time | 05:00 |
| Hanoi Capanne | Central European Time | 05:00 |
| Hanoi Cape Breton | Atlantic Time | 10:00 |
| Hanoi Canena | Central European Time | 05:00 |
| Hanoi Candolim | India Standard Time | 01:30 |
| Hanoi Canfield | Eastern Time | 11:00 |
| Hanoi Cangey | Central European Time | 05:00 |
| Hanoi Canley Heights | Eastern Australia Time | -03:00 |
| Hanoi Canley Vale | Eastern Australia Time | -03:00 |
| Hanoi Canmore | Mountain Time | 13:00 |
| Hanoi Cannington | Western Australia Time | -01:00 |
| Hanoi Cannington | Eastern Time | 11:00 |
| Hanoi Cannon Air Force Base | Mountain Time | 13:00 |