AGL Altimeter UTC 
Learn to Fly
MARCH 12, 2024
The last four digits are the time of the METAR/SPECI, which is always given in coordinated universal time (UTC). A “Z” is appended to the end of the time to denote the time is given in Zulu time (UTC) as opposed to local time. The altimeter setting is reported as inches of mercury (inHg) in a four-digit number group.
Pilot Institute
MAY 25, 2024
The start and end dates and times are coded in YYMMDDttt format (UTC time). B) 2106231700 is the start time and date in UTC. C) 2106232300 is the end time and date in UTC. High-pressure conditions decrease altimeter accuracy, affecting terrain clearance and aircraft spacing. Each subject has its own FAA keyword.
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