得到总秒数

var i = TimeSpan.FromTicks(startDate.Ticks).TotalSeconds;

并从秒获取datetime

var thatDateTime = new DateTime().AddSeconds(i)

这将以hh:mm:ss格式返回

 public static string ConvertTime(long secs)
    {
        TimeSpan ts = TimeSpan.FromSeconds(secs);
        string displayTime = $"{ts.Hours}:{ts.Minutes}:{ts.Seconds}";
        return displayTime;
    }

在VB。NET，但是在c#中也是一样的:

Dim x As New TimeSpan(0, 0, 80)
debug.print(x.ToString())
' Will print 00:01:20

对于。net <= 4.0使用TimeSpan类。

TimeSpan t = TimeSpan.FromSeconds( secs );

string answer = string.Format("{0:D2}h:{1:D2}m:{2:D2}s:{3:D3}ms", 
                t.Hours, 
                t.Minutes, 
                t.Seconds, 
                t.Milliseconds);

(Inder Kumar Rathore)对于。net > 4.0你可以使用

TimeSpan time = TimeSpan.FromSeconds(seconds);

//here backslash is must to tell that colon is
//not the part of format, it just a character that we want in output
string str = time .ToString(@"hh\:mm\:ss\:fff");

确保seconds小于TimeSpan.MaxValue.TotalSeconds以避免异常。

对于。net > 4.0你可以使用

TimeSpan time = TimeSpan.FromSeconds(seconds);

//here backslash is must to tell that colon is
//not the part of format, it just a character that we want in output
string str = time .ToString(@"hh\:mm\:ss\:fff");

如果你想要日期时间格式，你也可以这样做

TimeSpan time = TimeSpan.FromSeconds(seconds);
DateTime dateTime = DateTime.Today.Add(time);
string displayTime = dateTime.ToString("hh:mm:tt");

有关更多信息，您可以检查自定义TimeSpan格式字符串

得到总秒数

var i = TimeSpan.FromTicks(startDate.Ticks).TotalSeconds;

并从秒获取datetime

var thatDateTime = new DateTime().AddSeconds(i)