C++ 时间操作（获取毫秒级）
//使用标准C语言的time函数，可以满足一般性需要#include
#include
int main( void )
{
time_t t = time( 0 );
char tmp;
strftime( tmp, sizeof(tmp), "%Y/%m/%d %X %A 本年第%j天 %z",
localtime(&t) );
puts( tmp );
return 0;
}
//GetLocalTime获取当前系统时间，精确到微妙级
#include
#include
int main( void )
{
SYSTEMTIME sys;
GetLocalTime( &sys );
printf( "M/d/d d:d:d.d 星期\n"
,sys.wYear,sys.wMonth,sys.wDay
,sys.wHour,sys.wMinute,sys.wSecond,sys.wMilliseconds
,sys.wDayOfWeek);
return 0;
}
//利用win32 APIQueryPerformanceFrequency与QueryPerformanceCounter，可以更精确精确的计算，例如拿来测试，网络抓包的精确分析
using namespace std;
int main()
{
LARGE_INTEGER lv,lv_b;
// 获取每秒多少CPU Performance Tick
QueryPerformanceFrequency( &lv );
// 转换为每个Tick多少秒
double secondsPerTick = 1.0 / lv.QuadPart;
QueryPerformanceCounter( &lv_b );
for ( size_t i = 0; i < 100; ++i ) {
// 获取CPU运行到现在的Tick数
QueryPerformanceCounter( &lv );
cout.precision( 6 );
// 计算CPU运行到现在的时间
// 比GetTickCount和timeGetTime更加精确
LONGLONG duration = lv.QuadPart-lv_b.QuadPart;
double timeElapsedTotal = secondsPerTick * duration;
cout << fixed << showpoint << timeElapsedTotal << endl;
//printf( "%lf \n", timeElapsedTotal ) ;
}
return 0;
}
//如果上面还不能满足你的需求，请看下面
可以提供纳秒级的精确计算，而且跨平台
CString GetTimeStr()
{
SYSTEMTIME time;
GetLocalTime(&time);
CString year;
CString month;
CString day;
year.Format(_T("%d"), time.wYear);
month.Format(_T("%d"), time.wMonth);
day.Format(_T("%d"), time.wDay);
month = time.wMonth < 10 ? (_T("0") + month):month;
day = time.wDay < 10 ? (_T("0") + day):day;
wstring strTime = year + _T("/") + month + _T("/") + day + _T(" ");
WCHAR* pTime = new WCHAR;
wstring strFormat = _T("HH:mm:ss");
GetTimeFormat(LOCALE_INVARIANT , LOCALE_USE_CP_ACP, &time, strFormat.c_str(), pTime, 30);
strTime += pTime;
CString milliseconds;
milliseconds.Format(_T("%d"), time.wMilliseconds);
strTime += _T(".") + milliseconds;
return strTime.c_str();
}
返回的日期时间的格式 如：2015/06/20 14:32:25.456
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