Get time in milliseconds using C

Question

I m making a program in which I need to get the time in milliseconds  By time  I mean a number that is never equal to itself  and is always 1000 numbers bigger than it was a second ago  I ve tried converting DateTime Now to a TimeSpan and getting the TotalMilliseconds from that    but I ve heard it isn t perfectly accurate   Is there an easier way to do this

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The DateTime Ticks property gets the number of ticks that represent the date and time   10 000 Ticks is a millisecond  10 000 000 ticks per second

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You can try the QueryPerformanceCounter native method  See http   www pinvoke net default aspx kernel32 QueryPerformanceCounter html for more information  This is what the Stopwatch class uses   See How to get timestamp of tick precision in  NET   C   for more information   Stopwatch GetTimestamp   gives access to this method   public static long GetTimestamp          if IsHighResolution             long timestamp   0           SafeNativeMethods QueryPerformanceCounter out timestamp            return timestamp              else            return DateTime UtcNow Ticks

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Use System DateTime Now ToUniversalTime    That puts your reading in a known reference-based millisecond format that totally eliminates day change  etc

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I used DateTime Now TimeOfDay TotalMilliseconds  for current day   hope it helps you out as well

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I use the following class  I found it on the Internet once  postulated to be the best NOW          lt summary gt Class to get current timestamp with enough precision lt  summary gt  static class CurrentMillis       private static readonly DateTime Jan1St1970   new DateTime  1970  1  1  0  0  0  DateTimeKind Utc            lt summary gt Get extra long current timestamp lt  summary gt      public static long Millis   get   return  long   DateTime UtcNow - Jan1St1970  TotalMilliseconds           Source unknown

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long milliseconds   DateTime Now Ticks   TimeSpan TicksPerMillisecond    This is actually how the various Unix conversion methods are implemented in the DateTimeOffset class   NET Framework 4 6    NET Standard 1 3     long milliseconds   DateTimeOffset Now ToUnixTimeMilliseconds

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Use the Stopwatch class      Provides a set of methods and   properties that you can use to   accurately measure elapsed time    There is some good info on implementing it here   Performance Tests  Precise Run Time Measurements with System Diagnostics Stopwatch

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Using Stopwatch class we can achieve it from System Diagnostics  Stopwatch stopwatch    new Stopwatch    stopwatch Start    stopwatch Stop    Debug WriteLine stopwatch ElapsedMilliseconds

[c#] Get time in milliseconds using C#

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