c++输出当前时间，精确到微秒

头文件

#include <time.h>
#include <stdio.h>

函数接口

void printTime(){
    //time utils
    time_t tt;
    struct timeval tv_;
    struct tm *timeinfo;
    long tv_ms =0,tv_us=0;
    char output[20];
    time(&tt);
    timeinfo = localtime(&tt);
    gettimeofday(&tv_,NULL);
    strftime(output, 20,"%Y-%m-%d %H:%M:%S",timeinfo);
    tv_ms=tv_.tv_usec/1000;
    tv_us=tv_.tv_usec%1000;
    printf("time is :%s %ld:%ld\r\n",output, tv_ms,tv_us);
}
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