Have worked off Digital clocks in 24 hour mode all my adult life. Why? Hubby & I were in Army!
I also in job that worked in 24 hour clock. So easy. No mistaking of 'the time'!
IF I have an Analogue clock OR Watch, Roman Numerals' it's got to be! Just love them! Something very 'oldey-worldey' about them, so to speak!
As my actual job was SO date & time oriented, have clocks all over the house, so too, Calendars!