| Abbreviation | Definition |
|---|---|
| LST | Local Sidereal Time |
| LST | Local Standard Time |
| LT | Local Time |
| LTC | Longitudinal Time Code |
| LZT | Local Zone Time |
| MDT | Mountain Daylight Time [UTC - 0600] |
| MET | Middle European Time [UTC + 0100] |
| METDST | Middle European Time Daylight Saving Time [UTC + 0200] |
| MLT | Magnetic Local Time |
| MSD | Moscow Summer Time |
| MSK | Moscow Time |
| MST | Moscow Standard Time |
| MST | Mountain Standard Time [UTC - 0700] |
| MT | Moluccas Time [UTC + 0830] |
| MT | Mountain Time [UTC - 0700] |
| MW | Monday/Wednesday |
| MYT | Malaysia Time |
| NDST | New Digital Standard Time |
| NDT | Newfoundland Daylight Time [UTC - 0230] |
| NFT | NewFoundland Time [UTC - 0330] |