| Humboldt Bahour | India Standard Time | -10:30 |
| Humboldt Baga | India Standard Time | -10:30 |
| Humboldt Bagà | Central European Time | -07:00 |
| Humboldt Appenzell District | Central European Time | -07:00 |
| Humboldt Apple Springs | Central Time | 00:00 |
| Humboldt Applecross | Western Australia Time | -13:00 |
| Humboldt Badamanavarthekaval | India Standard Time | -10:30 |
| Humboldt Badolato Marina | Central European Time | -07:00 |
| Humboldt Baden bei Wien | Central European Time | -07:00 |
| Humboldt Badia Polesine | Central European Time | -07:00 |
| Humboldt Badia Tedalda | Central European Time | -07:00 |
| Humboldt Apollo Beach | Eastern Time | -01:00 |
| Humboldt Aoulouz | Western European Time | -06:00 |
| Humboldt Aougrout | Central European Time | -06:00 |
| Humboldt Albisola Superiore | Central European Time | -07:00 |
| Humboldt Albert Park | Eastern Australia Time | -15:00 |
| Humboldt Antibes | Central European Time | -07:00 |
| Humboldt Antigonish | Atlantic Time | -02:00 |
| Humboldt Antananarivo | East Africa Time | -08:00 |
| Humboldt Antwerp | Central European Time | -07:00 |
| Humboldt Anzola dell'Emilia | Central European Time | -07:00 |
| Humboldt Ao Nang | Indochina Time | -12:00 |
| Humboldt Aoba Ward | Japan Time | -14:00 |
| Humboldt Aoi Ward | Japan Time | -14:00 |
| Humboldt Anzegem | Central European Time | -07:00 |
| Humboldt Anzegem | Central European Time | -07:00 |
| Humboldt Alba Adriatica | Central European Time | -07:00 |
| Humboldt Alavandipuram | India Standard Time | -10:30 |
| Humboldt Alaró | Central European Time | -07:00 |
| Humboldt Alaska | Atlantic Time | -02:00 |
| Humboldt Alaska | Central Time | 00:00 |
| Humboldt Alaska | Eastern Time | -01:00 |
| Humboldt Alata | Central European Time | -07:00 |
| Humboldt Alappuzha | India Standard Time | -10:30 |
| Humboldt Alamarathupatti | India Standard Time | -10:30 |
| Humboldt Alagón | Central European Time | -07:00 |
| Humboldt Alachua | Eastern Time | -01:00 |
| Humboldt Al-Qayrawan | Central European Time | -06:00 |