| Old Basing Barnstable | Eastern Time | 05:00 |
| Old Basing Durango | Central Time | 06:00 |
| Old Basing Durağan | Turkey Time | -02:00 |
| Old Basing Dunster | United Kingdom Time | 00:00 |
| Old Basing Dundrum | United Kingdom Time | 00:00 |
| Old Basing Dundrum | Ireland Time | 00:00 |
| Old Basing Dundee | Eastern Time | 05:00 |
| Old Basing Dunlap | Central Time | 06:00 |
| Old Basing Dunning | United Kingdom Time | 00:00 |
| Old Basing Dunsborough | Western Australia Time | -07:00 |
| Old Basing Dungu | Central Africa Time | -01:00 |
| Old Basing Dungun | Malaysia Time | -07:00 |
| Old Basing Dunkirk | Central European Time | -01:00 |
| Old Basing Freiburg | Central European Time | -01:00 |
| Old Basing Frenchtown | Eastern Time | 05:00 |
| Old Basing Fresnedillas de la Oliva | Central European Time | -01:00 |
| Old Basing Friday Harbor | Pacific Time | 08:00 |
| Old Basing Friedberg | Central European Time | -01:00 |
| Old Basing Friedland | Central European Time | -01:00 |
| Old Basing Frostburg | Eastern Time | 05:00 |
| Old Basing Frodsham | United Kingdom Time | 00:00 |
| Old Basing Friendsville | Eastern Time | 05:00 |
| Old Basing Fruitland Park | Eastern Time | 05:00 |
| Old Basing Granbury | Central Time | 06:00 |
| Old Basing Granby | Mountain Time | 07:00 |
| Old Basing Grand Blanc | Eastern Time | 05:00 |
| Old Basing Grand Canyon Village | Mountain Time | 08:00 |
| Old Basing Grand Chute | Central Time | 06:00 |
| Old Basing Frazier Park | Pacific Time | 08:00 |
| Old Basing Frederica | Eastern Time | 05:00 |
| Old Basing Franschhoek | South Africa Standard Time | -01:00 |
| Old Basing Franz Josef Glacier | New Zealand Time | -11:00 |
| Old Basing Franklin Township | Eastern Time | 05:00 |
| Old Basing Fredonia | Eastern Time | 05:00 |
| Old Basing Freeport | Central Time | 06:00 |
| Old Basing Freeland | Eastern Time | 05:00 |
| Old Basing Erzhausen | Central European Time | -01:00 |
| Old Basing Ernakulam | India Standard Time | -04:30 |