Conversion Formulas

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

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