| Fort Irwin Chagford | United Kingdom Time | -08:00 |
| Fort Irwin Ulmen | Central European Time | -09:00 |
| Fort Irwin Bull Bay | United Kingdom Time | -08:00 |
| Fort Irwin Ulrichsberg | Central European Time | -09:00 |
| Fort Irwin Chablis | Central European Time | -09:00 |
| Fort Irwin Ulundurpet | India Standard Time | -12:30 |
| Fort Irwin Bulle | Central European Time | -09:00 |
| Fort Irwin Ulverston | United Kingdom Time | -08:00 |
| Fort Irwin Chalong | Indochina Time | -14:00 |
| Fort Irwin Ulverstone | Eastern Australia Time | -17:00 |
| Fort Irwin Bundeena | Eastern Australia Time | -17:00 |
| Fort Irwin Chakpachuria | India Standard Time | -12:30 |
| Fort Irwin Bundaberg Central | Eastern Australia Time | -17:00 |
| Fort Irwin Cabudare | Venezuela Time | -03:00 |
| Fort Irwin Bundaberg West | Eastern Australia Time | -17:00 |
| Fort Irwin Cabrils | Central European Time | -09:00 |
| Fort Irwin Bundanoon | Eastern Australia Time | -17:00 |
| Fort Irwin Cabramatta | Eastern Australia Time | -17:00 |
| Fort Irwin Bukit Mertajam | Malaysia Time | -15:00 |
| Fort Irwin Cabrerets | Central European Time | -09:00 |
| Fort Irwin Bukit Beruang | Malaysia Time | -15:00 |
| Fort Irwin Cadalso | Central European Time | -09:00 |
| Fort Irwin Bukit Kayu Hitam | Malaysia Time | -15:00 |
| Fort Irwin Cadalso de los Vidrios | Central European Time | -09:00 |
| Fort Irwin Buira | Central European Time | -09:00 |
| Fort Irwin Cadiz | Central Time | -02:00 |
| Fort Irwin Bonnac | Central European Time | -09:00 |
| Fort Irwin Cadereyta Jiménez | Central Time | -02:00 |
| Fort Irwin Boppelsen | Central European Time | -09:00 |
| Fort Irwin Cabazon | Pacific Time | 00:00 |
| Fort Irwin Boquete | Eastern Time | -02:00 |
| Fort Irwin Cabo de Gata | Central European Time | -09:00 |
| Fort Irwin Booneville | Central Time | -02:00 |
| Fort Irwin Cabarete | Atlantic Time | -03:00 |
| Fort Irwin Boonville | Pacific Time | 00:00 |
| Fort Irwin Byrdstown | Central Time | -02:00 |
| Fort Irwin Boothbay | Eastern Time | -03:00 |
| Fort Irwin Byrnihat | India Standard Time | -12:30 |
| Fort Irwin Boothbay Harbor | Eastern Time | -03:00 |
| Fort Irwin Byron | Eastern Time | -03:00 |
| Fort Irwin Buford | Eastern Time | -03:00 |
| Fort Irwin Byron Bay | Eastern Australia Time | -17:00 |
| Fort Irwin Buggenhout | Central European Time | -09:00 |
| Fort Irwin Bytča | Central European Time | -09:00 |
| Fort Irwin Buggiano | Central European Time | -09:00 |
| Fort Irwin Byford | Western Australia Time | -15:00 |
| Fort Irwin Buenos Aires | Argentina Time | -04:00 |
| Fort Irwin Bondi Beach | Eastern Australia Time | -17:00 |
| Fort Irwin Bondi Junction | Eastern Australia Time | -17:00 |
| Fort Irwin Bonifay | Central Time | -02:00 |