| Seongnam-si Matola | Central Africa Time | 07:00 |
| Seongnam-si Culiacán Rosales | Mexican Pacific Time | 16:00 |
| Seongnam-si Zaragoza | Central European Time | 08:00 |
| Seongnam-si Gorakhpur | India Standard Time | 03:30 |
| Seongnam-si Xiangtan | China Time | 01:00 |
| Seongnam-si Ipoh | Malaysia Time | 01:00 |
| Seongnam-si Mississauga | Eastern Time | 14:00 |
| Seongnam-si Boston | Eastern Time | 14:00 |
| Seongnam-si Puyang Chengguanzhen | China Time | 01:00 |
| Seongnam-si Nantong | China Time | 01:00 |
| Seongnam-si Mudanjiang | China Time | 01:00 |
| Seongnam-si Athens | Eastern European Time | 07:00 |
| Seongnam-si Santo André | Brasilia Time | 12:00 |
| Seongnam-si Nouakchott | Greenwich Mean Time | 09:00 |
| Seongnam-si Pointe-Noire | West Africa Time | 08:00 |
| Seongnam-si Aguascalientes | Central Time | 15:00 |
| Seongnam-si Memphis | Central Time | 15:00 |
| Seongnam-si Kryvyi Rih | Eastern European Time | 07:00 |
| Seongnam-si Acapulco | Central Time | 15:00 |
| Seongnam-si João Pessoa | Brasilia Time | 12:00 |
| Seongnam-si Ansan-si | Korean Time | 00:00 |
| Seongnam-si Benghazi | Eastern European Time | 07:00 |
| Seongnam-si Frankfurt | Central European Time | 08:00 |
| Seongnam-si Krasnodar | Moscow Time | 06:00 |
| Seongnam-si Guilin | China Time | 01:00 |
| Seongnam-si Palermo | Central European Time | 08:00 |
| Seongnam-si Colombo | India Standard Time | 03:30 |
| Seongnam-si Lilongwe | Central Africa Time | 07:00 |
| Seongnam-si Oran | Central European Time | 08:00 |
| Seongnam-si Diyarbakir | Turkey Time | 06:00 |
| Seongnam-si Taguig | Philippine Time | 01:00 |
| Seongnam-si New South Memphis | Central Time | 15:00 |
| Seongnam-si Ulyanovsk | Ulyanovsk Time | 05:00 |
| Seongnam-si Kotli | Pakistan Time | 04:00 |
| Seongnam-si Okayama | Japan Time | 00:00 |
| Seongnam-si Zhanjiang | China Time | 03:00 |
| Seongnam-si Ahmadi | Arabian Time | 06:00 |
| Seongnam-si Yogyakarta | Western Indonesia Time | 02:00 |
| Seongnam-si North York | Eastern Time | 14:00 |
| Seongnam-si Chișinău | Eastern European Time | 07:00 |
| Seongnam-si Wrocław | Central European Time | 08:00 |
| Seongnam-si Cheongju-si | Korean Time | 00:00 |
| Seongnam-si Anyang-si | Korean Time | 00:00 |
| Seongnam-si Tebessa | Central European Time | 08:00 |
| Seongnam-si Zhenjiang | China Time | 01:00 |
| Seongnam-si Portland | Pacific Time | 17:00 |
| Seongnam-si Winnipeg | Central Time | 15:00 |
| Seongnam-si Andong | China Time | 01:00 |
| Seongnam-si Oklahoma City | Central Time | 15:00 |
| Seongnam-si Izhevsk | Samara Time | 05:00 |