Disclaimer: of course, everything is a spectrum. To ADHD-people, caffeine has varying effects. Some get tired from it, others it affects less or not at all.
First of, in Europe we use ISO 8601, which is quite different from the military time which the USA uses.
Second, in my home country we still say "16 on the clock" or "15:45 on the clock" (just translated to the native language, eg. "Klokken 16") to signify we're talking time and not weight or distance.