将时间戳转换成年月日时分秒的字符串(ubuntu20.04，C++)

• 源文件 test.cpp

#include <iostream>
#include <sys/time.h>
#include <unistd.h>
#include <iomanip>
using namespace std;


// 获取当前时间戳(精确到毫秒)
int64_t getSysTimeMs()
{
    struct timeval tv;
    gettimeofday(&tv, nullptr);
    return (int64_t)(tv.tv_sec * 1000 + tv.tv_usec / 1000);
}

int main()
{
    time_t time = getSysTimeMs()/1000;
    tm *ptm = std::localtime(&time);
    std::ostringstream oss;
    oss << put_time(ptm, "%Y-%m-%d_%H:%M:%S");
    string dateStr = oss.str();
    cout<< "current  time ：" << dateStr << endl;
}

• CMakeLists.txt

cmake_minimum_required(VERSION 3.0)
project(test1)

add_definitions(-std=c++17)

set(CMAKE_CXX_STANDARD 17)
# set(CMAKE_BUILD_TYPE Release)
set(CMAKE_BUILD_TYPE Debug)

include_directories("include/")

add_executable(test1
               src/test.cpp
               )