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What is Greenwich Mean (Z) Time?
Greenwich
Mean Time, or Z (Zulu) Time, refers to a universal 24-hour clock which runs
from 0000z to 2359z. You can convert Standard/ Daylight Savings Time to
Greenwich Mean Time (GMT) by first converting your local time to 24-hour time
by adding 12 hours, ie. 3:00pm=1500. Then add the appropriate number of hours
as shown below:
|
STANDARD TIME
(OCT-APR) |
DAYLIGHT SAVINGS
(APR-OCT) |
| Eastern Time |
add 5 hours |
add 4 hours |
| Central Time |
add 6 hours |
add 5 hours |
| Mountain Time |
add 7 hours |
add 6 hours |
| Pacific Time |
add 8 hours |
add 7 hours |
For
example, if local Eastern Standard Time is 6:00pm, convert this to 1800 on the
24-hour clock, then add 5 hours = 2300GMT, or 2300Z Time. If local Mountain
Daylight Savings Time is 1:00pm, convert this to 1300 on a 24-hour clock, then
add 6 hours = 1900GMT, or 1900Z.
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