在C++实际项目中，有时候需要当前时间和过去时间做对比，因此找到了一种方法，经检测可用。

话不多说，直接上代码——

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//getLocalTime.cpp

#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <iostream>
#include <sstream>
#include <string>
using namespace std;

std::string FaGetSysTime() {
  struct timeval tv;
  gettimeofday(&tv, NULL);
  struct tm* pTime;
  pTime = localtime(&tv.tv_sec);

  std::string sTemp;
  std::ostringstream oss;

  //year
  oss << pTime->tm_year + 1900 << "-";

  //month
  if (pTime->tm_mon < 9) {
    oss << "0" << pTime->tm_mon + 1 << "-";
  } else {
    oss << pTime->tm_mon + 1 << "-";
  }

  //day
  if (pTime->tm_mday <= 10) {
    oss << "0" << pTime->tm_mday - 1 << " ";
  } else {
    oss << pTime->tm_mday - 1 << " ";
  }

  //hour
  if (pTime->tm_hour < 10) {
    oss << "0" << pTime->tm_hour << ":";
  } else {
    oss << pTime->tm_hour << ":";
  }

  //minute
  if (pTime->tm_min < 10) {
    oss << "0" << pTime->tm_min << ":";
  } else {
    oss << pTime->tm_min << ":";
  }

  //second
  if (pTime->tm_sec < 10) {
    oss << "0" << pTime->tm_sec << ".";
  } else {
    oss << pTime->tm_sec << ".";
  }

  //ms
  oss << tv.tv_usec / 1000;

  //us
  oss << tv.tv_usec % 1000;

  sTemp += oss.str();

  return sTemp;
}

int main() {
  cout << "当前时间：" << FaGetSysTime() << endl;

  return 0;
}

编译结果输出：

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patten@patten-hp:~/workspace/collide$ g++ getLocalTime.cpp 
patten@patten-hp:~/workspace/collide$ ./a.out 
当前时间：2019-09-22 10:06:02.663171
patten@patten-hp:~/workspace/collide$

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