Conversion Formulas

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If given Greenwich Mean Time and the zone description, the formula for finding local mean
time would be:
LMT = GMT (Z) + ZD
Example #1
If LMT is 0700 and the zone description is -6, what will the Greenwich Mean Time be?
GMT (Z) = LMT - ZD
GMT (Z) = 0700 ­ (-6)
GMT (Z) = 1300z
NOTE: Remember that to subtract a negative number, you actually add.
NOTE: You will usually see a "z" after Zulu time.
Now, try some conversions with flight time figured in.
Example #2
If you are given an arrival time into Manama, Bahrain (+3) of 1200 Z, what is your local
arrival time?
LMT = GMT + ZD
LMT = 1200 Z + (+3)
LMT = 1500
Example #3
You are leaving Navy North Island (ZD + 8) at 1100L with a flight time of 4+00. Will you
arrive at NAS Pensacola (ZD + 6) in time for Happy Hour (1600-1800)?
Step 1 - Convert take off time to ZULU
GMT = LMT - ZD
= 1100 - (-8)
GMT = 1900Z Take Off
Step2 - "Fly in ZULU"
1900Z + 4+00 = 2300Z Land
Step 3 - Convert landing time to local
LMT = GMT + ZD
= 2300Z + (-6)
= 1700L
4.6-31

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