Vaguely related: I don't think people are being taught how to read analog clock faces nearly as much anymore, and apparently phrases like "quarter past ten" are becoming, so to speak, anachronisms.
The only one that I know of as being an anachronism is saying "quarter of" or similar. At one point people decided that 'of' meant 'to' and after a while we forgot that because it was stupid. People still say quarter past though.
Also vaguely related, I've come to realize some people find metric measurements easier than feet and inches.
I find the fractions simpler. Need a half of that half? Just double the denominator.
My wife would seemingly rather keep counting .1 centimeters.
The same applies with clocks. It's easier for me to rough out how long I have if I just chop the face into fractions vs mental arithmetic, as brutal as that sounds. What do you mean this guy can't divide 30 in half?
The spatial representation on an analogue clockface is far more evident. Each 15 minute interval sweeps out a quarter of the face with the minute hand.
In Germany, that would be quarter 7, which means either the quarter in the 7th hour or the 7th time that a quarter has passed since the hour, which is of course that same. (Unless you are in a part, that got conquered by the US after 2WW, which now uses "English time".)
So do the public schools here, and we have 3 analog clocks in my house, but 3/4 of my children cannot read an analog clock, and 2/4 of them do not understand me when I say "quarter past" or "quarter to" no matter how many times I explain it.
