static public string ToDaysHoursMinutesSecondsString(this Duration item)
{
int days;
int hours;
int minutes;
int seconds;
item.GetDaysHoursMinutesSeconds(out days, out hours, out minutes, out seconds);
return(days + ":" +
hours.ToString("D2") + ":" +
minutes.ToString("D2") + ":" +
seconds.ToString("D2"));
}