| Dublin Harrison Hot Springs | Pacific Time | 08:00 |
| Dublin Harrison | Central Time | 06:00 |
| Dublin Harwich | Eastern Time | 05:00 |
| Dublin Harrodsburg | Eastern Time | 05:00 |
| Dublin Harrow | United Kingdom Time | 00:00 |
| Dublin Hartsdale | Eastern Time | 05:00 |
| Dublin Hartselle | Central Time | 06:00 |
| Dublin Hartshorne | Central Time | 06:00 |
| Dublin Hartsville | Eastern Time | 05:00 |
| Dublin Hartville | Eastern Time | 05:00 |
| Dublin Harfleur | Central European Time | -01:00 |
| Dublin Hardys Bay | Eastern Australia Time | -11:00 |
| Dublin Harburg | Central European Time | -01:00 |
| Dublin Hanwood | Eastern Australia Time | -11:00 |
| Dublin Hanumanbari | India Standard Time | -05:30 |
| Dublin Happy Valley | Pacific Time | 08:00 |
| Dublin Hanover | Eastern Time | 05:00 |
| Dublin Hang Dong | Indochina Time | -07:00 |
| Dublin Handsworth Wood | United Kingdom Time | 00:00 |
| Dublin Handforth | United Kingdom Time | 00:00 |
| Dublin Hanamkonda | India Standard Time | -05:30 |
| Dublin Hanau | Central European Time | -01:00 |
| Dublin Hamilton | Eastern Australia Time | -11:00 |
| Dublin Hämeenkyrö | Eastern European Time | -02:00 |
| Dublin Hamilton Township | Eastern Time | 05:00 |
| Dublin Hammerfest | Central European Time | -01:00 |
| Dublin Hammersbach | Central European Time | -01:00 |
| Dublin Hampton | Eastern Australia Time | -11:00 |
| Dublin Hammonton | Eastern Time | 05:00 |
| Dublin Hampi | India Standard Time | -05:30 |
| Dublin Hammamet Sud | Central European Time | -01:00 |
| Dublin Hammamet | Central European Time | -01:00 |
| Dublin Halli | Eastern European Time | -02:00 |
| Dublin Hallsville | Central Time | 06:00 |
| Dublin Hallam | Eastern Australia Time | -11:00 |
| Dublin Halifax | Eastern Time | 05:00 |
| Dublin Halton Hills | Eastern Time | 05:00 |
| Dublin Hamburg | Central European Time | -01:00 |
| Dublin Hadleigh | United Kingdom Time | 00:00 |
| Dublin Hagenow | Central European Time | -01:00 |
| Dublin Hagenthal-le-Haut | Central European Time | -01:00 |
| Dublin Hahndorf | Central Australia Time | -10:30 |
| Dublin HaGoshrim | Israel Time | -02:00 |
| Dublin Haiku-Pauwela | Hawaii-Aleutian Time | 10:00 |
| Dublin Haleiwa | Hawaii-Aleutian Time | 10:00 |
| Dublin Hales Corners | Central Time | 06:00 |
| Dublin Half Moon Bay | Pacific Time | 08:00 |
| Dublin Haldensleben | Central European Time | -01:00 |
| Dublin Hakone | Japan Time | -09:00 |
| Dublin Hakata Ward | Japan Time | -09:00 |