DateTime st = DateTime.Now;

DateTime ed = DateTime.Now;

TimeSpan ts = ed.Subtract(st);

string output = String.Format("{0:00}:{1:00}:{2:00}", ts.TotalHours, ts.Minutes, ts.Seconds);

 

//時間與字串之間的轉換

//時間轉字串

string datestring = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss ffff")

string datestring = DateTime.Now.ToString("s", System.Globalization.DateTimeFormatInfo.InvariantInfo)
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