[C++知识库]linux c 获得当前时间精确到毫秒

#include <sys/time.h>
#include <stdio.h>
#include <unistd.h>
#include<iostream>
#include<string>
using namespace std;
string GetLocalTimeWithMs(void)
{
    struct timeval curTime;
    gettimeofday(&curTime, NULL);
    int milli = curTime.tv_usec / 1000;

    char buffer[80] = {0};
    struct tm nowTime;
    localtime_r(&curTime.tv_sec, &nowTime);//把得到的值存入临时分配的内存中，线程安全
    strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", &nowTime);

    char currentTime[84] = {0};
    snprintf(currentTime, sizeof(currentTime), "%s:%03d", buffer, milli);
    return currentTime;
}

int main()
{
    std::string current_time = GetLocalTimeWithMs();
    std::cout << current_time << std::endl;
    return 0;
}