All my digital clocks and watches are set to 24 hour time. However, most of the people I interact with (Americans) are only fluent in the 12 hour dialect.

As a result, if someone asks me the time, I will look a clock at clock that says15:30 and without thinking I say “three thirty.”

In Italy, people will say “fifteen thirty” and I just get confused. I do the translation naturally but it only works one way.