| Seongnam-si Luanda | West Africa Time | 08:00 |
| Seongnam-si Quezon City | Philippine Time | 01:00 |
| Seongnam-si Addis Ababa | East Africa Time | 06:00 |
| Seongnam-si Nairobi | East Africa Time | 06:00 |
| Seongnam-si Chicago | Central Time | 15:00 |
| Seongnam-si Salvador | Brasilia Time | 12:00 |
| Seongnam-si Jaipur | India Standard Time | 03:30 |
| Seongnam-si Dar es Salaam | East Africa Time | 06:00 |
| Seongnam-si Lanzhou | China Time | 01:00 |
| Seongnam-si Incheon | Korean Time | 00:00 |
| Seongnam-si Yunfu | China Time | 01:00 |
| Seongnam-si Toronto | Eastern Time | 14:00 |
| Seongnam-si Basrah | Arabian Time | 06:00 |
| Seongnam-si Navi Mumbai | India Standard Time | 03:30 |
| Seongnam-si Osaka | Japan Time | 00:00 |
| Seongnam-si Mogadishu | East Africa Time | 06:00 |
| Seongnam-si Daegu | Korean Time | 00:00 |
| Seongnam-si Faisalabad | Pakistan Time | 04:00 |
| Seongnam-si Izmir | Turkey Time | 06:00 |
| Seongnam-si Dakar | Greenwich Mean Time | 09:00 |
| Seongnam-si Lucknow | India Standard Time | 03:30 |
| Seongnam-si Giza | Eastern European Time | 07:00 |
| Seongnam-si Fortaleza | Brasilia Time | 12:00 |
| Seongnam-si Cali | Colombia Time | 14:00 |
| Seongnam-si Surabaya | Western Indonesia Time | 02:00 |
| Seongnam-si Belo Horizonte | Brasilia Time | 12:00 |
| Seongnam-si Nanchang | China Time | 01:00 |
| Seongnam-si Rome | Central European Time | 08:00 |
| Seongnam-si Mashhad | Iran Time | 05:30 |
| Seongnam-si Borough of Brooklyn | Eastern Time | 14:00 |
| Seongnam-si Houston | Central Time | 15:00 |
| Seongnam-si Queens | Eastern Time | 14:00 |
| Seongnam-si Nagpur | India Standard Time | 03:30 |
| Seongnam-si Maracaibo | Venezuela Time | 13:00 |
| Seongnam-si Brasília | Brasilia Time | 12:00 |
| Seongnam-si Santo Domingo | Atlantic Time | 13:00 |
| Seongnam-si Nagoya | Japan Time | 00:00 |
| Seongnam-si Brisbane | Eastern Australia Time | -01:00 |
| Seongnam-si Havana | Cuba Time | 14:00 |
| Seongnam-si Paris | Central European Time | 08:00 |
| Seongnam-si Al Mawşil al Jadīdah | Arabian Time | 06:00 |
| Seongnam-si Johannesburg | South Africa Standard Time | 07:00 |
| Seongnam-si Kowloon | Hong Kong Time | 01:00 |
| Seongnam-si Al Başrah al Qadīmah | Arabian Time | 06:00 |
| Seongnam-si Almaty | East Kazakhstan Time | 03:00 |
| Seongnam-si Medellin | Colombia Time | 14:00 |
| Seongnam-si Tashkent | Uzbekistan Time | 04:00 |
| Seongnam-si Algiers | Central European Time | 08:00 |
| Seongnam-si Khartoum | Central Africa Time | 07:00 |
| Seongnam-si Accra | Greenwich Mean Time | 09:00 |