uFormatDuration function
Implementation
String uFormatDuration(Duration value) {
String two(int n) => n.toString().padLeft(2, "0");
final String minutes = two(value.inMinutes.remainder(60));
final String seconds = two(value.inSeconds.remainder(60));
return value.inHours > 0 ? "${two(value.inHours)}:$minutes:$seconds" : "$minutes:$seconds";
}