| Byford Hong | Central European Time | 07:00 |
| Byford Hong Kong | Hong Kong Time | 00:00 |
| Byford Hong Kong | Hong Kong Time | 00:00 |
| Byford Hong Kong | Hong Kong Time | 00:00 |
| Byford Hounslow | United Kingdom Time | 08:00 |
| Byford Hotchkiss | Mountain Time | 15:00 |
| Byford Hoylake | United Kingdom Time | 08:00 |
| Byford Howell | Eastern Time | 13:00 |
| Byford Howrah | India Standard Time | 02:30 |
| Byford Hoxie | Central Time | 14:00 |
| Byford Huanggang | China Time | 00:00 |
| Byford Huajuapan de León | Central Time | 14:00 |
| Byford Himmelkron | Central European Time | 07:00 |
| Byford Hima | East Africa Time | 05:00 |
| Byford Hillsborough | Eastern Time | 13:00 |
| Byford Hioki | Japan Time | -01:00 |
| Byford Hiram | Eastern Time | 13:00 |
| Byford Hingham | Eastern Time | 13:00 |
| Byford Hochdorf | Central European Time | 07:00 |
| Byford Hitzacker | Central European Time | 07:00 |
| Byford Homebush | Eastern Australia Time | -03:00 |
| Byford Hondarribia | Central European Time | 07:00 |
| Byford Homps | Central European Time | 07:00 |
| Byford Holywood | United Kingdom Time | 08:00 |
| Byford Holmes Beach | Eastern Time | 13:00 |
| Byford Holme's Hill | United Kingdom Time | 08:00 |
| Byford Hollywood | Eastern Time | 13:00 |
| Byford Holly Hill | Eastern Time | 13:00 |
| Byford Holly Hill | Eastern Time | 13:00 |
| Byford Hokes Bluff | Central Time | 14:00 |
| Byford Hokuto | Japan Time | -01:00 |
| Byford Holden Hill | Central Australia Time | -02:30 |
| Byford Holdenville | Central Time | 14:00 |
| Byford Holdorf | Central European Time | 07:00 |
| Byford Holdrege | Central Time | 14:00 |
| Byford Holesov | Central European Time | 07:00 |
| Byford Holgate | Eastern Australia Time | -03:00 |
| Byford Hogsback | South Africa Standard Time | 06:00 |
| Byford Hofheim | Central European Time | 07:00 |
| Byford Hoge Hexel | Central European Time | 07:00 |
| Byford Heubach | Central European Time | 07:00 |
| Byford Hethersett | United Kingdom Time | 08:00 |
| Byford Hewlett | Eastern Time | 13:00 |
| Byford Hexham | Eastern Australia Time | -03:00 |
| Byford Hexham | United Kingdom Time | 08:00 |
| Byford Heydon | United Kingdom Time | 08:00 |
| Byford Highgate | Western Australia Time | 00:00 |
| Byford High Falls | Eastern Time | 13:00 |
| Byford Higashiyama Ward | Japan Time | -01:00 |
| Byford Higashi Ward | Japan Time | -01:00 |