Sounds like a lot of people in the US are going to setting their Windows OS to the EU locale.
By the way, Royale with cheese is not actually a thing across all Europe, in Spain it's called "cuarto de libra" which is the actual translation for "Quarter-Pounder", this made the Spanish translation of that Pulp Fiction dialogue somehow nonsense and made most Spaniards realize where the name "cuarto de libra" came from, before that people usually assumed it was some commercial name without any particular meaning.
Edit: Appreciate all the replies, thank you.
People might still say "meet at 7" instead of 19 for a shortcut it it's obvious from the context, but they will write it as 19:00 and think of it as 19:00.
BTW we never did "am" vs "pm", we had "1..11 morning" -> "12 noon" -> "1..11 afternoon" -> "12 midnight". And for afternoon hours the "afternoon" was usually skipped. So no 12 am/pm confusion. I could never get used to the American am/pm.
It seems like a bad idea if I've ever seen 13.
In speech we use 12 hours. But then it's mostly clear from context.
Tbh I don't see how you can live with 12 hour clocks on appliances in the US. I bought a Cuisinart coffee filter and it has the 12 hour clock and an invisible dot that shows am or pm. It can also be set to start on its own at a certain hour. 60% of the time, when I change the settings i get it wrong because who the hell can see that dot?
In written and official setting yes, time is always specified in 24H.
But depending on culture and language, in speak most people use the 12H sistem because the AM/PM is implied to be obvious from the context and 24h one has too many syllables: "Let's meet tonight at seven" instead of "Let's meet tonight at nine-teen."
This is how it is for me as well, once you learn 24h time it's about as simple as can be, and I learned when I was a kid. I don't think I've ever lived anywhere where 24h time was the norm for writing/displaying though - or maybe I just didn't notice because I'm fine with it.