| Welkom Hong | Central European Time | 01:00 |
| Welkom Hong Kong | Hong Kong Time | -06:00 |
| Welkom Hong Kong | Hong Kong Time | -06:00 |
| Welkom Hong Kong | Hong Kong Time | -06:00 |
| Welkom Hounslow | United Kingdom Time | 02:00 |
| Welkom Hotchkiss | Mountain Time | 09:00 |
| Welkom Hoylake | United Kingdom Time | 02:00 |
| Welkom Howell | Eastern Time | 07:00 |
| Welkom Howrah | India Standard Time | -03:30 |
| Welkom Hoxie | Central Time | 08:00 |
| Welkom Huanggang | China Time | -06:00 |
| Welkom Huajuapan de León | Central Time | 08:00 |
| Welkom Himmelkron | Central European Time | 01:00 |
| Welkom Hima | East Africa Time | -01:00 |
| Welkom Hillsborough | Eastern Time | 07:00 |
| Welkom Hioki | Japan Time | -07:00 |
| Welkom Hiram | Eastern Time | 07:00 |
| Welkom Hingham | Eastern Time | 07:00 |
| Welkom Hochdorf | Central European Time | 01:00 |
| Welkom Hitzacker | Central European Time | 01:00 |
| Welkom Homebush | Eastern Australia Time | -09:00 |
| Welkom Hondarribia | Central European Time | 01:00 |
| Welkom Homps | Central European Time | 01:00 |
| Welkom Holywood | United Kingdom Time | 02:00 |
| Welkom Holmes Beach | Eastern Time | 07:00 |
| Welkom Holme's Hill | United Kingdom Time | 02:00 |
| Welkom Hollywood | Eastern Time | 07:00 |
| Welkom Holly Hill | Eastern Time | 07:00 |
| Welkom Holly Hill | Eastern Time | 07:00 |
| Welkom Hokes Bluff | Central Time | 08:00 |
| Welkom Hokuto | Japan Time | -07:00 |
| Welkom Holden Hill | Central Australia Time | -08:30 |
| Welkom Holdenville | Central Time | 08:00 |
| Welkom Holdorf | Central European Time | 01:00 |
| Welkom Holdrege | Central Time | 08:00 |
| Welkom Holesov | Central European Time | 01:00 |
| Welkom Holgate | Eastern Australia Time | -09:00 |
| Welkom Hogsback | South Africa Standard Time | 00:00 |
| Welkom Hofheim | Central European Time | 01:00 |
| Welkom Hoge Hexel | Central European Time | 01:00 |
| Welkom Heubach | Central European Time | 01:00 |
| Welkom Hethersett | United Kingdom Time | 02:00 |
| Welkom Hewlett | Eastern Time | 07:00 |
| Welkom Hexham | Eastern Australia Time | -09:00 |
| Welkom Hexham | United Kingdom Time | 02:00 |
| Welkom Heydon | United Kingdom Time | 02:00 |
| Welkom Highgate | Western Australia Time | -06:00 |
| Welkom High Falls | Eastern Time | 07:00 |
| Welkom Higashiyama Ward | Japan Time | -07:00 |
| Welkom Higashi Ward | Japan Time | -07:00 |