参考
public object Convert(object value, Type targetType, object parameter, string language)
{
int seconds = (int)value;
DateTime dtStart = TimeZoneInfo.ConvertTimeFromUtc(new DateTime(1970,1,1),TimeZoneInfo.Local);
var time = dtStart.Add(TimeSpan.FromSeconds(seconds));
return time.TimeOfDay.ToString(@"hh\:mm\:ss");
}
end