I remember from my kid/teenage years that there used to be a lot of clocks in the environment, both analog and digital, both public and private (e.g. digital clock scrolling between ads on a LED billboard over a store). I do also remember you couldn't exactly trust them - often enough, they would be broken, or they would show the wrong time for weeks after switching from/to DST. Analog clocks were the worst, because they rarely had a second hand, so you couldn't easily tell if they're working at all.