Get hh:mm:ss from seconds

getHMS.dart

String getHMS(int seconds) {
    if (seconds == null) return "";
    final int minutes = (seconds / 60).truncate();
    final int hours = (minutes / 60).truncate();
    String secondsStr = (seconds % 60).toString().padLeft(2, '0');
    String minutesStr = (minutes % 60).toString().padLeft(2, '0');
    String hoursStr = (hours % 60).toString().padLeft(2, '0');
    return "$hoursStr.$minutesStr.$secondsStr";
}