| Fort Irwin Newtown | Eastern Australia Time | -17:00 |
| Fort Irwin Newtown | Eastern Time | -03:00 |
| Fort Irwin Mermaid Beach | Eastern Australia Time | -17:00 |
| Fort Irwin Mermaid Waters | Eastern Australia Time | -17:00 |
| Fort Irwin Mering | Central European Time | -09:00 |
| Fort Irwin Merkez Mahallesi | Turkey Time | -10:00 |
| Fort Irwin Meridian charter Township | Eastern Time | -03:00 |
| Fort Irwin Meridian charter Township | Eastern Time | -03:00 |
| Fort Irwin Mersch | Central European Time | -09:00 |
| Fort Irwin Mersin | Turkey Time | -10:00 |
| Fort Irwin Merritt Island | Eastern Time | -03:00 |
| Fort Irwin Merrylands | Eastern Australia Time | -17:00 |
| Fort Irwin Meredith | Eastern Time | -03:00 |
| Fort Irwin Merewether | Eastern Australia Time | -17:00 |
| Fort Irwin Méru | Central European Time | -09:00 |
| Fort Irwin Metropolis | Central Time | -02:00 |
| Fort Irwin Metochi | Eastern European Time | -10:00 |
| Fort Irwin Metrocentre | United Kingdom Time | -08:00 |
| Fort Irwin Munderipur | India Standard Time | -12:30 |
| Fort Irwin München-Flughafen | Central European Time | -09:00 |
| Fort Irwin Muncy | Eastern Time | -03:00 |
| Fort Irwin Mullaitivu | India Standard Time | -12:30 |
| Fort Irwin Mullanpur Dakha | India Standard Time | -12:30 |
| Fort Irwin Mullins | Atlantic Time | -03:00 |
| Fort Irwin Mullins | Eastern Time | -03:00 |
| Fort Irwin Mullumbimby | Eastern Australia Time | -17:00 |
| Fort Irwin Mullingar | Ireland Time | -08:00 |
| Fort Irwin Mumbai | India Standard Time | -12:30 |
| Fort Irwin Mumbai | India Standard Time | -12:30 |
| Fort Irwin Muravera | Central European Time | -09:00 |
| Fort Irwin Muntinlupa | Philippine Time | -15:00 |
| Fort Irwin Munxar | Central European Time | -09:00 |
| Fort Irwin Munxar | Central European Time | -09:00 |
| Fort Irwin Mur-de-Sologne | Central European Time | -09:00 |
| Fort Irwin Münstertal | Central European Time | -09:00 |
| Fort Irwin Münsingen | Central European Time | -09:00 |
| Fort Irwin Münster | Central European Time | -09:00 |
| Fort Irwin Münnerstadt | Central European Time | -09:00 |