Earlier quoted context omitted.
There are huge swaths of Americans who will literally not know what 17:00 translates to in AM/PM. And even for the Americans that do know, virtually all of them (unless they are in the military or another profession that commonly uses 24h time), will have to "translate" by subtracting 12 in their head for PM times. 24h time is extremely rare in everyday use in the US.
>subtracting 12 in their head for PM times. Is that how you're supposed to do it? All my life I've been subtracting 2 and ignoring the fist digit for PM times (with the exception of post 20:00 times). I just noticed that when I was a kid and been using that all this time e.g. 17:00 - 2:00 = 15:00 => 5:00
22:00 - 2:00 = 20:00 => 0:00