In the aviation world, they don't use AM/PM times. Instead, all times are assumed to be AM unless they're labeled NOTAM.
https://explainxkcd.com/3024/
The comic before this had to do with miles per hour versus knots, so I think Randall Monroe is in flight school.
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The comic before this had to do with miles per hour versus knots, so I think Randall Monroe is in flight school.