| Byrdstown Lake Park | Eastern Time | -01:00 |
| Byrdstown Lake Placid | Eastern Time | -01:00 |
| Byrdstown Lakeside | Atlantic Time | -02:00 |
| Byrdstown Lakemba | Eastern Australia Time | -17:00 |
| Byrdstown Lakeport | Pacific Time | 02:00 |
| Byrdstown Lanai City | Hawaii-Aleutian Time | 04:00 |
| Byrdstown Lanark | United Kingdom Time | -06:00 |
| Byrdstown Landau | Central European Time | -07:00 |
| Byrdstown Landau an der Isar | Central European Time | -07:00 |
| Byrdstown Landford | United Kingdom Time | -06:00 |
| Byrdstown Landstuhl | Central European Time | -07:00 |
| Byrdstown Lanesboro | Central Time | 00:00 |
| Byrdstown Langenzenn | Central European Time | -07:00 |
| Byrdstown Langeoog | Central European Time | -07:00 |
| Byrdstown Lapedona | Central European Time | -07:00 |
| Byrdstown Lantana | Eastern Time | -01:00 |
| Byrdstown Lanzarote | Western European Time | -06:00 |
| Byrdstown Lansdowne | Eastern Time | -01:00 |
| Byrdstown Langley | Pacific Time | 02:00 |
| Byrdstown Langford | Western Australia Time | -14:00 |
| Byrdstown Langkawi | Malaysia Time | -14:00 |
| Byrdstown Langkawi | Malaysia Time | -14:00 |
| Byrdstown Langley | Pacific Time | 02:00 |
| Byrdstown Laakirchen | Central European Time | -07:00 |
| Byrdstown La Victoria | Colombia Time | -01:00 |
| Byrdstown La Victoria | Peru Time | -01:00 |
| Byrdstown La Sénia | Central European Time | -07:00 |
| Byrdstown La Tijera | Central Time | 00:00 |
| Byrdstown Ladenburg | Central European Time | -07:00 |
| Byrdstown Ladysmith | Pacific Time | 02:00 |
| Byrdstown Lady Lake | Eastern Time | -01:00 |
| Byrdstown Lac-Drolet | Eastern Time | -01:00 |
| Byrdstown Lac-Mégantic | Eastern Time | -01:00 |
| Byrdstown Labrador | Eastern Australia Time | -16:00 |
| Byrdstown Labuan | Malaysia Time | -14:00 |
| Byrdstown Labège | Central European Time | -07:00 |
| Byrdstown Labin | Central European Time | -07:00 |
| Byrdstown Lake City | Eastern Time | -01:00 |
| Byrdstown Lake Como | Eastern Time | -01:00 |
| Byrdstown Lake Cowichan | Pacific Time | 02:00 |
| Byrdstown Lake Delton | Central Time | 00:00 |
| Byrdstown Lake Elmo | Central Time | 00:00 |
| Byrdstown Lake George | Eastern Time | -01:00 |
| Byrdstown Lake Forest Park | Pacific Time | 02:00 |
| Byrdstown Lake Mary | Eastern Time | -01:00 |
| Byrdstown Lake Bluff | Central Time | 00:00 |
| Byrdstown Lake Buena Vista | Eastern Time | -01:00 |
| Byrdstown Lahaina | Hawaii-Aleutian Time | 04:00 |
| Byrdstown Lagos | West Africa Time | -07:00 |
| Byrdstown LaGrange | Eastern Time | -01:00 |