| Abbreviation | Definition |
|---|---|
| NIST | National Institute of Standards and Technology |
| NST | Neopian Standard Time |
| NST | Newfoundland Standard Time [UTC - 0330] |
| NST | North Sumatra Time [UTC + 0630] |
| NT | Nome Time [UTC - 1100] |
| NZDT | New Zealand Daylight Time [UTC + 1300] |
| NZMT | New Zealand Mean Time [UT + 1130, obsolete] |
| NZST | New Zealand Standard Time [UTC + 1200] |
| NZT | New Zealand Time |
| OBT | On-Board Time |
| PDST | Pacific Daylight Saving Time [UTC - 0700] |
| PDT | Pacific Daylight Time [UTC - 0700] |
| PKT | Pakistan Standard Time |
| PM | Pacific Meridian |
| PM | Post Meridiem |
| PPM | Planning and Performance Management |
| PST | Pacific Standard Time [UTC - 0800] |
| PST | Pakistan Standard Time |
| PT | Pacific Time [UTC - 0800] |
| RTX | Report Time Crossing |