正整数转化为时间

private string FormatTime(int time)
{
　　int hour = 0, min = 0, sec = 0;
　　hour = time/60/60;
　　min = (time%(60*60))/60;
　　sec = (time%(60*60))%60%60;
　　return string.Format("{0:00}:{1:00}:{2:00}", hour, min, sec);
}