blocks|key|119039|text|这应该是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|119040|DateTime.Now.ToString("hh.mm.ss.ffffff");|code-block|syntax|javascript|119041|如果你不需要显示它，只需要知道时间差，那就不要把它转换成字符串。就让它保持原样，DateTime.Now();|offset|length|style|CODE|119042|并使用TimeSpan了解时间间隔之间的差异：|119043|示例|119044|DateTime+start;
TimeSpan+time;

start+=+DateTime.Now;

//Do+something+here

time+=+DateTime.Now+-+start;
label1.Text+=+String.Format("{0}.{1}",+time.Seconds,+time.Milliseconds.ToString().PadLeft(3,+'0'));|119045|entityMap^0|0|0|14|F|0|3|8|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@$I|10|J|11|K|L]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

This should work:

<pre><code>DateTime.Now.ToString("hh.mm.ss.ffffff");
</code></pre>

If you don't need it to be displayed and just need to know the time difference, well don't convert it to a String. Just leave it as, <code>DateTime.Now();</code>

And use <code>TimeSpan</code> to know the difference between time intervals:

Example

<pre><code>DateTime start;
TimeSpan time;

start = DateTime.Now;

//Do something here

time = DateTime.Now - start;
label1.Text = String.Format("{0}.{1}", time.Seconds, time.Milliseconds.ToString().PadLeft(3, '0'));
</code></pre>

blocks|key|336503|text|Pyromancer's+answer对我来说似乎很好，但也许您想：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|336504|DateTime.Now.Millisecond|code-block|syntax|javascript|336505|但是如果你在比较日期，TimeSpan是个不错的选择。|336506|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/16032451/get-datetime-now-with-milliseconds-precision/16032507#16032507^0|0|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<a href="https://stackoverflow.com/questions/16032451/get-datetime-now-with-milliseconds-precision/16032507#16032507">Pyromancer's answer</a> seems pretty good to me, but maybe you wanted:

<pre><code>DateTime.Now.Millisecond
</code></pre>

But if you are comparing dates, TimeSpan is the way to go.

blocks|key|336508|text|DateTime.Now.ToString("ddMMyyyyhhmmssffff")|type|unstyled|depth|inlineStyleRanges|entityRanges|data|336509|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

DateTime.Now.ToString("ddMMyyyyhhmmssffff")

blocks|key|119087|text|据我所知，你可以这样回答：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|119088|DateTime+dateTime+=+DateTime.Now;
DateTime+dateTimeInMilliseconds+=+dateTime.AddTicks(-1+*+dateTime.Ticks+%25+10000);+|code-block|syntax|javascript|119089|这将截断小于1毫秒的刻度。|119090|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

As far as I understand the question, you can go for:

<pre><code>DateTime dateTime = DateTime.Now;
DateTime dateTimeInMilliseconds = dateTime.AddTicks(-1 * dateTime.Ticks % 10000); 
</code></pre>

This will cut off ticks smaller than 1 millisecond.

blocks|key|336573|text|我正在寻找一个类似的解决方案，基于这个帖子上的建议，我使用了下面的DateTime.Now.ToString("MM/dd/yyyy+hh:mm:ss.fff")，它工作起来很有魅力。注意：.fff是您希望捕获的精确值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|336574|entityMap^0|X|1C|2N|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I was looking for a similar solution, base on what was suggested on this thread, I use the following 
 <code>DateTime.Now.ToString("MM/dd/yyyy hh:mm:ss.fff")</code> 
, and it work like charm. Note: that <code>.fff</code> are the precision numbers that you wish to capture.

blocks|key|336635|text|public+long+millis()+{
++return+(long.MaxValue+%2B+DateTime.Now.ToBinary())+/+10000;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|336636|如果您想要微秒，只需将10000更改为10，如果您想要微秒的第10秒，请删除/+10000。|unstyled|offset|length|style|CODE|336637|entityMap^0|0|B|5|J|2|12|7|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]|$G|Q|H|R|I|J]|$G|S|H|T|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|U|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>public long millis() {
 return (long.MaxValue + DateTime.Now.ToBinary()) / 10000;
}
</code></pre>

If you want microseconds, just change <code>10000</code> to <code>10</code>, and if you want the 10th of micro, delete <code>/ 10000</code>.

blocks|key|119180|text|使用毫秒的DateTime结构，格式如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|119181|string+timestamp+=+DateTime.UtcNow.ToString("yyyy-MM-dd+HH:mm:ss.fff",+
CultureInfo.InvariantCulture);
timestamp+=+timestamp.Replace("-",+".");|code-block|syntax|javascript|119182|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use DateTime Structure with milliseconds and format like this:

<pre><code>string timestamp = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff", 
CultureInfo.InvariantCulture);
timestamp = timestamp.Replace("-", ".");
</code></pre>

blocks|key|336698|text|如果您仍然需要日期而不是像其他答案那样的字符串，只需添加此扩展方法即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|336699|public+static+DateTime+ToMillisecondPrecision(this+DateTime+d)+{
++++return+new+DateTime(d.Year,+d.Month,+d.Day,+d.Hour,+d.Minute,
++++++++++++++++++++++++d.Second,+d.Millisecond,+d.Kind);
}|code-block|syntax|javascript|336700|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you still want a date instead of a string like the other answers, just add this extension method.

<pre><code>public static DateTime ToMillisecondPrecision(this DateTime d) {
 return new DateTime(d.Year, d.Month, d.Day, d.Hour, d.Minute,
 d.Second, d.Millisecond, d.Kind);
}
</code></pre>

blocks|key|119249|text|DateTime.UtcNow和DateTime.Now的问题在于，根据计算机和操作系统的不同，它可能只能精确到10到15毫秒。但是，在windows计算机上，可以通过使用低级函数GetSystemTimePreciseAsFileTime来获得微秒精度，请参阅下面的函数GetTimeStamp()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|119250|++++[System.Security.SuppressUnmanagedCodeSecurity,+System.Runtime.InteropServices.DllImport("kernel32.dll")]
++++static+extern+void+GetSystemTimePreciseAsFileTime(out+FileTime+pFileTime);

++++[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
++++public+struct+FileTime++{
++++++++public+const+long+FILETIME_TO_DATETIMETICKS+=+504911232000000000;+++//+146097+=+days+in+400+year+Gregorian+calendar+cycle.+504911232000000000+=+4+*+146097+*+86400+*+1E7
++++++++public+uint+TimeLow;++++//+least+significant+digits
++++++++public+uint+TimeHigh;+++//+most+sifnificant+digits
++++++++public+long+TimeStamp_FileTimeTicks+{+get+{+return+TimeHigh+*+4294967296+%2B+TimeLow;+}+}+++++//+ticks+since+1-Jan-1601+(1+tick+=+100+nanosecs).+4294967296+=+2%5E32
++++++++public+DateTime+dateTime+{+get+{+return+new+DateTime(TimeStamp_FileTimeTicks+%2B+FILETIME_TO_DATETIMETICKS);+}+}
++++}

++++public+static+DateTime+GetTimeStamp()+{+
++++++++FileTime+ft;+GetSystemTimePreciseAsFileTime(out+ft);
++++++++return+ft.dateTime;
++++}|code-block|syntax|javascript|119251|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/en-us/library/windows/desktop/hh706895(v=vs.85).aspx^0|0|F|G|C|3S|E|2I|U|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

The trouble with <code>DateTime.UtcNow</code> and <code>DateTime.Now</code> is that, depending on the computer and operating system, it may only be accurate to between 10 and 15 milliseconds. However, on windows computers one can use by using the low level function <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/hh706895(v=vs.85).aspx" rel="nofollow noreferrer">GetSystemTimePreciseAsFileTime</a> to get microsecond accuracy, see the function <code>GetTimeStamp()</code> below.

<pre><code> [System.Security.SuppressUnmanagedCodeSecurity, System.Runtime.InteropServices.DllImport("kernel32.dll")]
 static extern void GetSystemTimePreciseAsFileTime(out FileTime pFileTime);

 [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
 public struct FileTime {
 public const long FILETIME_TO_DATETIMETICKS = 504911232000000000; // 146097 = days in 400 year Gregorian calendar cycle. 504911232000000000 = 4 * 146097 * 86400 * 1E7
 public uint TimeLow; // least significant digits
 public uint TimeHigh; // most sifnificant digits
 public long TimeStamp_FileTimeTicks { get { return TimeHigh * 4294967296 + TimeLow; } } // ticks since 1-Jan-1601 (1 tick = 100 nanosecs). 4294967296 = 2^32
 public DateTime dateTime { get { return new DateTime(TimeStamp_FileTimeTicks + FILETIME_TO_DATETIMETICKS); } }
 }

 public static DateTime GetTimeStamp() { 
 FileTime ft; GetSystemTimePreciseAsFileTime(out ft);
 return ft.dateTime;
 }
</code></pre>

blocks|key|119270|text|尝试使用datetime.now.ticks。这提供了纳秒精度。取两个滴答的差值(stoptick+-+starttick)/10,000是指定间隔的毫秒。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|119271|https://docs.microsoft.com/en-us/dotnet/api/system.datetime.ticks?view=netframework-4.7.2|offset|length|119272|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2H|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

try using datetime.now.ticks. this provides nanosecond precision. taking the delta of two ticks (stoptick - starttick)/10,000 is the millisecond of specified interval.

<a href="https://docs.microsoft.com/en-us/dotnet/api/system.datetime.ticks?view=netframework-4.7.2" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/dotnet/api/system.datetime.ticks?view=netframework-4.7.2</a>

blocks|key|336798|text|另一种选择是从源DateTime值构造一个新的DateTime实例：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|336799|//+current+date+and+time
var+now+=+DateTime.Now;

//+modified+date+and+time+with+millisecond+accuracy
var+msec+=+new+DateTime(now.Year,+now.Month,+now.Day,+now.Hour,+now.Minute,+now.Second,+now.Millisecond,+now.Kind);|code-block|syntax|javascript|336800|不需要做任何to-string和from-string的转换，而且它也是非常容易理解和阅读的代码。|336801|entityMap^0|8|8|N|8|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Another option is to construct a new <code>DateTime</code> instance from the source <code>DateTime</code> value:
<pre><code>// current date and time
var now = DateTime.Now;

// modified date and time with millisecond accuracy
var msec = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second, now.Millisecond, now.Kind);
</code></pre>
There's no need to do any to-string and from-string conversions, and it's also very well understandable and readable code.

How can I exactly construct a time stamp of actual time with milliseconds precision? 

I need something like 16.4.2013 9:48:00:123. Is this possible? I have an application, where I sample values 10 times per second, and I need to show them in a graph.

Get DateTime.Now with milliseconds precision

我如何准确地构造一个毫秒精度的实际时间的时间戳？我需要像16.4.2013 9:48:00:123这样的东西。这个是可能的吗？我有一个应用程序，我每秒采样值10次，我需要将它们显示在图形中。

问获取毫秒精度的DateTime.Now
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