获取精确到毫秒的当前日期时间

#include <iostream>
#include <sys/timeb.h>
#include <time.h>
#include <stdio.h>

using namespace std;

typedef char * PCHAR;

void Now(PCHAR buff);

int main()
{
    char buff[128];
    Now(buff);

    cout << buff << endl;
    return 0;
}

void Now(PCHAR buff)
{
    struct timeb tp;
    struct tm *tm;

    ftime(&tp);

    tm = localtime(&tp.time);

    sprintf(buff, "%.4d-%.2d-%.2d %.2d:%.2d:%.2d.%.3d",
            1900+ tm->tm_year,
            1 + tm->tm_mon,
            tm->tm_yday,
            tm->tm_hour,
            tm->tm_min,
            tm->tm_sec,
            tp.millitm);

}