| Abbreviation | Definition |
|---|---|
| WTZ | Greenland Eastern Daylight Time [UTC - 0100] |
| WTZ | World Time Zone |
| WUT | Austria Time [UTC + 0100] |
| WWV | Standard time and frequency station, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, Fort Collins, Colorado |
| WWVB | Standard Time And Frequency Station, 60KHz, Fort Collins, Colorado |
| WZCT | Western Zone Consideration Time |
| Y | Yukon Standard Time [UTC - 0900] |
| YDT | Yukon Daylight Time [UTC - 0800] |
| YST | Yukon Standard Time [UTC - 0900] |
| Z | Zulu Time (Coordinated Universal Time [UTC] / 'Greenwich Mean Time' ) |
| Z | Zulu Time (Coordinated Universal Time [UTC] /'Greenwich Mean Time' ) |
| ZT | Zone Time |
| ZULU | Coordinated Universal Time [UTC] / 'Greenwich Mean Time' |