Question

我有代码可以衡量一些操作花费的时间。如果日间节能在操作过程中生效，我会得到不准确的数据。

例如，我正在做

DateTime startAt = DateTime.Now;
DoOperation(); //day light saving takes effect in the middle
int seconds = (DateTime.Now - startAt).TotalSeconds;
//second has wrong seconds

有没有办法衡量这个？

由于

Answer 1

使用StopWatch类代替......例如

var stopWatch = new StopWatch();
stopWatch.Start();
//code here
stopWatch.Stop()
Console.WriteLine("elapsed millisconds " + stopwatch.ElapsedMilliseconds);

Answer 2

假设您使用的是c＃，则可以使用DateTime.UtcNow代替DateTime.Now

Answer 3

同样在.NET中有一个DateTime.Ticks ...可能会更准确一些，如果需要的话可以在XP上运行... MSDN上显示的示例：

DateTime centuryBegin = new DateTime(2001, 1, 1);
DateTime currentDate = DateTime.Now;

long elapsedTicks = currentDate.Ticks - centuryBegin.Ticks;
TimeSpan elapsedSpan = new TimeSpan(elapsedTicks);

Console.WriteLine("Elapsed from the beginning of the century to {0:f}:", 
                   currentDate);
Console.WriteLine("   {0:N0} nanoseconds", elapsedTicks * 100);
Console.WriteLine("   {0:N0} ticks", elapsedTicks);
Console.WriteLine("   {0:N2} seconds", elapsedSpan.TotalSeconds);
Console.WriteLine("   {0:N2} minutes", elapsedSpan.TotalMinutes);
Console.WriteLine("   {0:N0} days, {1} hours, {2} minutes, {3} seconds", 
                  elapsedSpan.Days, elapsedSpan.Hours, 
                  elapsedSpan.Minutes, elapsedSpan.Seconds);

// If run on December 14, 2007, at 15:23, this example displays the
// following output to the console:
//    Elapsed from the beginning of the century to Friday, December 14, 2007 3:23 PM:
//          219,338,580,000,000,000 nanoseconds
//          2,193,385,800,000,000 ticks
//          219,338,580.00 seconds
//          3,655,643.00 minutes
//          2,538 days, 15 hours, 23 minutes, 0 seconds

测量经过时间会计日光节省

3 个答案: