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What is the correct format for writing time in general?

  • A

    “hh:mm”, UTC

  • B

    “hh:mm”, local time

  • C

    “hh:mm:ss”, UTC

  • D

    “hh:mm:ss”, local time

ICAO Annex 11 - Air Traffic Services
2.26 Time in air traffic services

2.26.1 Air traffic services units shall use Coordinated Universal Time (UTC) and shall express the time in hours and minutes and, when required, seconds of the 24-hour day beginning at midnight.

ICAO Annex 5 - Units of Measurement to be Used in Air and Ground Operations
3. Presentation of time

3.4 Seconds should also be represented by two digits from 00 to 59 and followed by decimal fractions of a second if required.

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