formatHHMMSS static method
Implementation
static String formatHHMMSS(int second) {
int seconds = (second % 3600).truncate();
int minutes = second ~/ 60;
String minutesStr = (minutes).toString().padLeft(2, '0');
String secondsStr = (seconds % 60).toString().padLeft(2, '0');
return "$minutesStr:$secondsStr";
}