| Port Jefferson Al-Mamurah | Central European Time | -06:00 |
| Port Jefferson Al Jaghbub | Eastern European Time | -07:00 |
| Port Jefferson Al Hofuf | Arabian Time | -08:00 |
| Port Jefferson Alphington | Eastern Australia Time | -16:00 |
| Port Jefferson Almuwaylih | Arabian Time | -08:00 |
| Port Jefferson Almeley | United Kingdom Time | -05:00 |
| Port Jefferson Almargem do Bispo | Western European Time | -05:00 |
| Port Jefferson Altishofen | Central European Time | -06:00 |
| Port Jefferson Amherst | Eastern Time | 00:00 |
| Port Jefferson Altdorf | Central European Time | -06:00 |
| Port Jefferson Altentreptow | Central European Time | -06:00 |
| Port Jefferson Altavilla Vicentina | Central European Time | -06:00 |
| Port Jefferson Anamizu | Japan Time | -14:00 |
| Port Jefferson Anaconda | Mountain Time | 02:00 |
| Port Jefferson Amsterdam Airport Schiphol | Central European Time | -06:00 |
| Port Jefferson Amurrio | Central European Time | -06:00 |
| Port Jefferson Amriswil | Central European Time | -06:00 |
| Port Jefferson Amritsar Cantt. | India Standard Time | -10:30 |
| Port Jefferson Amory | Central Time | 01:00 |
| Port Jefferson Ampang | Malaysia Time | -13:00 |
| Port Jefferson Amorbach | Central European Time | -06:00 |
| Port Jefferson Ammon | Mountain Time | 02:00 |
| Port Jefferson Amirim | Israel Time | -07:00 |
| Port Jefferson Alconaba | Central European Time | -06:00 |
| Port Jefferson Alexander Heights | Western Australia Time | -13:00 |
| Port Jefferson Alexandria Bay | Eastern Time | 00:00 |
| Port Jefferson Alenquer | Western European Time | -05:00 |
| Port Jefferson Albisola Superiore | Central European Time | -06:00 |
| Port Jefferson Albert Park | Eastern Australia Time | -16:00 |
| Port Jefferson Alcanar | Central European Time | -06:00 |
| Port Jefferson Alcochete | Western European Time | -05:00 |
| Port Jefferson Almancil | Western European Time | -05:00 |
| Port Jefferson Allostock | United Kingdom Time | -05:00 |
| Port Jefferson Allenspark | Mountain Time | 02:00 |
| Port Jefferson Allenby Gardens | Central Australia Time | -15:30 |
| Port Jefferson Alfonso Lista | Philippine Time | -13:00 |
| Port Jefferson Alfornelos | Western European Time | -05:00 |
| Port Jefferson Algiers | South Africa Standard Time | -07:00 |
| Port Jefferson Algoma | Central Time | 01:00 |
| Port Jefferson Alger Centre | Central European Time | -06:00 |
| Port Jefferson Algerias | Colombia Time | 00:00 |
| Port Jefferson Algermissen | Central European Time | -06:00 |
| Port Jefferson Algood | Central Time | 01:00 |
| Port Jefferson Alhos Vedros | Western European Time | -05:00 |
| Port Jefferson Alhandra | Western European Time | -05:00 |
| Port Jefferson Besham City | Pakistan Time | -10:00 |
| Port Jefferson Berry | Eastern Australia Time | -16:00 |
| Port Jefferson Berthoud | Mountain Time | 02:00 |
| Port Jefferson Bethel | Eastern Time | 00:00 |
| Port Jefferson Bevier | Central Time | 01:00 |