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In aviation terminology, time is related to the time at the Zero Meridian, which runs North/South through Greenwich, England. It was formerly called Greenwich Mean Time (GMT). The current terminology is Coordinated Universal Time (abbreviated UTC). When speaking time, pilots and FAA personnel refer to UTC time as ZULU time. The time 1345Z would be pronounces as "One Three Four Five Zulu".
To convert US time zones to UTC time, add the following hour values.| Local Standard Time add | Local Daylight Time add | ||||||
|---|---|---|---|---|---|---|---|
| EST | CST | MST | PST | EDT | CDT | MDT | PST |
| + 5 hr | + 6 hr | + 7 hr | + 8 hr | + 4 hr | + 5 hr | + 6 hr | + 7 hr |
To convert from ZULU time back to US time zones, subtract the number of hours shown. In addition, time is expressed in Military Time (24 hour time).