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The prime meridian (or zero degrees longitude or the Universal Coordinate), passes through Greenwich, England. Military terminology for zero is z, or the word zulu. Thus there are several common ways people refer to this longitude for use as a time reference.
Zulu (Z)
Greenwich Mean Time (GMT)
Universal Coordinate Time (UT or UTC)
The following table may be helpful to convert from one of these times to local time. For Des Moines, IA, in the winter (CST), 18Z is 12 PM (noon).
|
EDT |
EST/CDT |
CST/MDT |
MST/PDT |
PST |
|
|
00 Z, GMT, UCT |
8pm |
7pm |
6pm |
5pm |
4pm |
|
06 Z, GMT, UCT |
2am |
1am |
12am |
11pm |
10pm |
|
12 Z, GMT, UCT |
8 am |
7am |
6am |
5am |
4am |
|
18 Z, GMT, UCT |
2pm |
1pm |
12pm |
11am |
10am |
|
24(00) Z, GMT, UCT |
8pm |
7pm |
6pm |
5pm |
4pm |
EST: Eastern Standard Time / EDT: Eastern Daylight Time
CST: Central Standard Time / CDT: Central Daylight Time
MST: Mountain Standard Time / MDT: Mountain Daylight Time
PST: Pacific Standard Time / PDT: Pacific Daylight Time