| Siheung-si Küsnacht | Central European Time | 08:00 |
| Siheung-si Kuwana | Japan Time | 00:00 |
| Siheung-si KwaMashu | South Africa Standard Time | 07:00 |
| Siheung-si Kuttippuram | India Standard Time | 03:30 |
| Siheung-si Kutztown | Eastern Time | 14:00 |
| Siheung-si Kurmond | Eastern Australia Time | -02:00 |
| Siheung-si Kurnool | India Standard Time | 03:30 |
| Siheung-si Kuruva | India Standard Time | 03:30 |
| Siheung-si Kurseong | India Standard Time | 03:30 |
| Siheung-si Kusatsu | Japan Time | 00:00 |
| Siheung-si Kushalnagar | India Standard Time | 03:30 |
| Siheung-si Kühlungsborn | Central European Time | 08:00 |
| Siheung-si Kukkundoor | India Standard Time | 03:30 |
| Siheung-si Kudasan | India Standard Time | 03:30 |
| Siheung-si Kubang Semang | Malaysia Time | 01:00 |
| Siheung-si Kuala Sepetang | Malaysia Time | 01:00 |
| Siheung-si Kuala Ketil | Malaysia Time | 01:00 |
| Siheung-si Kuala Berang | Malaysia Time | 01:00 |
| Siheung-si Kuala Lumpur | Malaysia Time | 01:00 |
| Siheung-si Kuala Lumpur | Malaysia Time | 01:00 |
| Siheung-si Kuala Lumpur | Malaysia Time | 01:00 |
| Siheung-si Kuala Lumpur | Malaysia Time | 01:00 |
| Siheung-si Kuala Perlis | Malaysia Time | 01:00 |
| Siheung-si Kriftel | Central European Time | 08:00 |
| Siheung-si Krąków | Central European Time | 08:00 |
| Siheung-si Kottiyam | India Standard Time | 03:30 |
| Siheung-si Kovalam | India Standard Time | 03:30 |
| Siheung-si Kottarakkara | India Standard Time | 03:30 |
| Siheung-si Koto | Japan Time | 00:00 |
| Siheung-si Kotobi | Greenwich Mean Time | 09:00 |
| Siheung-si Kotor | Central European Time | 08:00 |
| Siheung-si Kotor Varoš | Central European Time | 08:00 |
| Siheung-si Kosova Hora | Central European Time | 08:00 |
| Siheung-si Košice | Central European Time | 08:00 |
| Siheung-si Koshu | Japan Time | 00:00 |
| Siheung-si Kotara | Eastern Australia Time | -02:00 |
| Siheung-si Kota Belud | Malaysia Time | 01:00 |
| Siheung-si Kota Bharu | Malaysia Time | 01:00 |
| Siheung-si Kota Kinabalu | Malaysia Time | 01:00 |
| Siheung-si Kota Marudu | Malaysia Time | 01:00 |
| Siheung-si Kothav | India Standard Time | 03:30 |
| Siheung-si Köniz | Central European Time | 08:00 |
| Siheung-si Konolfingen | Central European Time | 08:00 |
| Siheung-si Konnunsuo | Eastern European Time | 07:00 |
| Siheung-si Konaklı Belediyesi | Turkey Time | 06:00 |
| Siheung-si Kondhapuri | India Standard Time | 03:30 |
| Siheung-si Königsleiten | Central European Time | 08:00 |
| Siheung-si Koratty | India Standard Time | 03:30 |
| Siheung-si Korčula | Central European Time | 08:00 |
| Siheung-si Koppa | India Standard Time | 03:30 |