| Cardiff Jindivick | Eastern Australia Time | 00:00 |
| Cardiff Karambakkudi | India Standard Time | 05:30 |
| Cardiff Jim Thorpe | Eastern Time | 15:00 |
| Cardiff Kittery | Eastern Time | 15:00 |
| Cardiff Jinan | China Time | 03:00 |
| Cardiff Kitty Hawk | Eastern Time | 15:00 |
| Cardiff Kitscoty | Mountain Time | 17:00 |
| Cardiff Kiyose | Japan Time | 02:00 |
| Cardiff Kita Ward | Japan Time | 02:00 |
| Cardiff Klil | Israel Time | 09:00 |
| Cardiff Klang Dong | Indochina Time | 04:00 |
| Cardiff Klagenfurt | Central European Time | 10:00 |
| Cardiff Klopein | Central European Time | 10:00 |
| Cardiff Knightdale | Eastern Time | 15:00 |
| Cardiff Knoxfield | Eastern Australia Time | 00:00 |
| Cardiff Knüllwald | Central European Time | 10:00 |
| Cardiff Chuo Ward | Japan Time | 02:00 |
| Cardiff Ko Samui | Indochina Time | 04:00 |
| Cardiff Ko Chang | Indochina Time | 04:00 |
| Cardiff Ko Pha-ngan | Indochina Time | 04:00 |
| Cardiff Ko Phra Thong | Indochina Time | 04:00 |
| Cardiff Kodagu | India Standard Time | 05:30 |
| Cardiff Kochi | India Standard Time | 05:30 |
| Cardiff Kochi | India Standard Time | 05:30 |
| Cardiff La Tijera | Central Time | 17:00 |
| Cardiff La Sénia | Central European Time | 10:00 |
| Cardiff Laakirchen | Central European Time | 10:00 |
| Cardiff La Victoria | Colombia Time | 16:00 |
| Cardiff La Victoria | Peru Time | 16:00 |
| Cardiff Labège | Central European Time | 10:00 |
| Cardiff Labin | Central European Time | 10:00 |
| Cardiff Labrador | Eastern Australia Time | 01:00 |
| Cardiff Labuan | Malaysia Time | 03:00 |
| Cardiff La Robine-sur-Galabre | Central European Time | 10:00 |
| Cardiff La Roche-en-Ardenne | Central European Time | 10:00 |
| Cardiff La Punt-Chamues-ch | Central European Time | 10:00 |
| Cardiff La Pobla de Farnals | Central European Time | 10:00 |
| Cardiff La Perouse | Eastern Australia Time | 00:00 |