将秒转换为(小时:分钟:秒:毫秒)时间的最佳方法是什么？

Question

将秒转换为(小时:分钟:秒:毫秒)时间的最佳方法是什么？

假设我有80秒,.NET中是否有任何专门的类/技术允许我将这些80秒转换为(00h:00m:00s:00ms)格式,比如DateTime或其他东西？

Answer 1

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);

(如Inder Kumar Rathore所述)对于.NET> 4.0,您可以使用

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");

(来自Nick Molyneux)确保秒小于TimeSpan.MaxValue.TotalSeconds避免异常.

Answer 2

对于.NET> 4.0,您可以使用

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");

或者如果你想要日期时间格式,那么你也可以这样做

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

有关更多信息,您可以查看自定义TimeSpan格式字符串

Answer 3

如果您知道有几秒钟,则可以通过调用TimeSpan.FromSeconds来创建TimeSpan值:

 TimeSpan ts = TimeSpan.FromSeconds(80);

然后,您可以获得天数,小时数,分钟数或秒数.或者使用其中一个ToString重载以您喜欢的任何方式输出它.

Answer 4

我做了一些基准测试,看看最快的方法是什么,这些是我的结果和结论.我运行了每个方法10M次并添加了评论,每次运行的平均时间.

如果您的输入毫秒不限于一天(结果可能是143:59:59.999),这些是从快到慢的选项:

// 0.86 ms
static string Method1(int millisecs)
{
    int hours = millisecs / 3600000;
    int mins = (millisecs % 3600000) / 60000;
    // Make sure you use the appropriate decimal separator
    return string.Format("{0:D2}:{1:D2}:{2:D2}.{3:D3}", hours, mins, millisecs % 60000 / 1000, millisecs % 1000);
}

// 0.89 ms
static string Method2(int millisecs)
{
    double s = millisecs % 60000 / 1000.0;
    millisecs /= 60000;
    int mins = millisecs % 60;
    int hours = millisecs / 60;
    return string.Format("{0:D2}:{1:D2}:{2:00.000}", hours, mins, s);
}

// 0.95 ms
static string Method3(int millisecs)
{
    TimeSpan t = TimeSpan.FromMilliseconds(millisecs);
    // Make sure you use the appropriate decimal separator
    return string.Format("{0:D2}:{1:D2}:{2:D2}.{3:D3}",
        (int)t.TotalHours,
        t.Minutes,
        t.Seconds,
        t.Milliseconds);
}

如果您的输入毫秒数限制为一天(结果将永远不会超过23:59:59.999),则这些选项可以从更快到更慢:

// 0.58 ms
static string Method5(int millisecs)
{
    // Fastest way to create a DateTime at midnight
    // Make sure you use the appropriate decimal separator
    return DateTime.FromBinary(599266080000000000).AddMilliseconds(millisecs).ToString("HH:mm:ss.fff");
}

// 0.59 ms
static string Method4(int millisecs)
{
    // Make sure you use the appropriate decimal separator
    return TimeSpan.FromMilliseconds(millisecs).ToString(@"hh\:mm\:ss\.fff");
}

// 0.93 ms
static string Method6(int millisecs)
{
    TimeSpan t = TimeSpan.FromMilliseconds(millisecs);
    // Make sure you use the appropriate decimal separator
    return string.Format("{0:D2}:{1:D2}:{2:D2}.{3:D3}",
        t.Hours,
        t.Minutes,
        t.Seconds,
        t.Milliseconds);
}

如果你的输入只是几秒钟,那么方法会稍快一点.同样,如果您的输入秒数不限于一天(您的结果可能是143:59:59):

// 0.63 ms
static string Method1(int secs)
{
    int hours = secs / 3600;
    int mins = (secs % 3600) / 60;
    secs = secs % 60;
    return string.Format("{0:D2}:{1:D2}:{2:D2}", hours, mins, secs);
}

// 0.64 ms
static string Method2(int secs)
{
    int s = secs % 60;
    secs /= 60;
    int mins = secs % 60;
    int hours = secs / 60;
    return string.Format("{0:D2}:{1:D2}:{2:D2}", hours, mins, s);
}

// 0.70 ms
static string Method3(int secs)
{
    TimeSpan t = TimeSpan.FromSeconds(secs);
    return string.Format("{0:D2}:{1:D2}:{2:D2}",
        (int)t.TotalHours,
        t.Minutes,
        t.Seconds);
}

如果您的输入秒数限制为一天(您的结果将永远不会超过23:59:59):

// 0.33 ms
static string Method5(int secs)
{
    // Fastest way to create a DateTime at midnight
    return DateTime.FromBinary(599266080000000000).AddSeconds(secs).ToString("HH:mm:ss");
}

// 0.34 ms
static string Method4(int secs)
{
    return TimeSpan.FromSeconds(secs).ToString(@"hh\:mm\:ss");
}

// 0.70 ms
static string Method6(int secs)
{
    TimeSpan t = TimeSpan.FromSeconds(secs);
    return string.Format("{0:D2}:{1:D2}:{2:D2}",
        t.Hours,
        t.Minutes,
        t.Seconds);
}

作为最后的评论,让我补充一点,我注意到string.Format如果你使用D2而不是更快一点00.

Answer 5

TimeSpan.FromSeconds(80);

http://msdn.microsoft.com/en-us/library/system.timespan.fromseconds.aspx

Answer 6

TimeSpan构造函数允许您在几秒钟内传递.只需声明一个TimeSpan类型的变量秒.例如:

TimeSpan span = new TimeSpan(0, 0, 500);
span.ToString();