| Poznań Harrison Hot Springs | Pacific Time | 09:00 |
| Poznań Harrison | Central Time | 07:00 |
| Poznań Harwich | Eastern Time | 06:00 |
| Poznań Harrodsburg | Eastern Time | 06:00 |
| Poznań Harrow | United Kingdom Time | 01:00 |
| Poznań Hartsdale | Eastern Time | 06:00 |
| Poznań Hartselle | Central Time | 07:00 |
| Poznań Hartshorne | Central Time | 07:00 |
| Poznań Hartsville | Eastern Time | 06:00 |
| Poznań Hartville | Eastern Time | 06:00 |
| Poznań Harfleur | Central European Time | 00:00 |
| Poznań Hardys Bay | Eastern Australia Time | -10:00 |
| Poznań Harburg | Central European Time | 00:00 |
| Poznań Hanwood | Eastern Australia Time | -10:00 |
| Poznań Hanumanbari | India Standard Time | -04:30 |
| Poznań Happy Valley | Pacific Time | 09:00 |
| Poznań Hanover | Eastern Time | 06:00 |
| Poznań Hang Dong | Indochina Time | -06:00 |
| Poznań Handsworth Wood | United Kingdom Time | 01:00 |
| Poznań Handforth | United Kingdom Time | 01:00 |
| Poznań Hanamkonda | India Standard Time | -04:30 |
| Poznań Hanau | Central European Time | 00:00 |
| Poznań Hamilton | Eastern Australia Time | -10:00 |
| Poznań Hämeenkyrö | Eastern European Time | -01:00 |
| Poznań Hamilton Township | Eastern Time | 06:00 |
| Poznań Hammerfest | Central European Time | 00:00 |
| Poznań Hammersbach | Central European Time | 00:00 |
| Poznań Hampton | Eastern Australia Time | -10:00 |
| Poznań Hammonton | Eastern Time | 06:00 |
| Poznań Hampi | India Standard Time | -04:30 |
| Poznań Hammamet Sud | Central European Time | 00:00 |
| Poznań Hammamet | Central European Time | 00:00 |
| Poznań Halli | Eastern European Time | -01:00 |
| Poznań Hallsville | Central Time | 07:00 |
| Poznań Hallam | Eastern Australia Time | -10:00 |
| Poznań Halifax | Eastern Time | 06:00 |
| Poznań Halton Hills | Eastern Time | 06:00 |
| Poznań Hamburg | Central European Time | 00:00 |
| Poznań Hadleigh | United Kingdom Time | 01:00 |
| Poznań Hagenow | Central European Time | 00:00 |
| Poznań Hagenthal-le-Haut | Central European Time | 00:00 |
| Poznań Hahndorf | Central Australia Time | -09:30 |
| Poznań HaGoshrim | Israel Time | -01:00 |
| Poznań Haiku-Pauwela | Hawaii-Aleutian Time | 11:00 |
| Poznań Haleiwa | Hawaii-Aleutian Time | 11:00 |
| Poznań Hales Corners | Central Time | 07:00 |
| Poznań Half Moon Bay | Pacific Time | 09:00 |
| Poznań Haldensleben | Central European Time | 00:00 |
| Poznań Hakone | Japan Time | -08:00 |
| Poznań Hakata Ward | Japan Time | -08:00 |