Hi

I also had this problem. The problem is that the time format string in modules/default/calendar/calendar.js is wrong for 24h setup.

Find these lines and change lower case hh into H in time format string.

case 24: {
			moment.updateLocale(config.language, {
				longDateFormat: {
					LT: "H:mm" // FIX here: was "hh:mm"
				}
			});
			break;
		}

This was already fixed in development branch: https://github.com/MichMich/MagicMirror/pull/943/files

@tbouron said in MMM-FlightTracker - Real time plane tracker using ADS-B systems:

And I think you had to rebuild the module because it was missing when you executed npm i (It is certainly not something I had to do on my Pi)

That’s correct. I cleared everything and tried again. The rebuild step is not necessary because the module is actually built during npm install step.