用C ++获取Unix时间戳

time()

#include <ctime>
#include <iostream>

int main()
{
    std::time_t result = std::time(nullptr);
    std::cout << std::asctime(std::localtime(&result))
              << result << \" seconds since the Epoch\\n\";
}

#include<iostream>
#include<ctime>

int main()
{
    std::time_t t = std::time(0);  // t is an integer type
    std::cout << t << \" seconds since 01-Jan-1970\\n\";
    return 0;
}

time()

1970-01-01T00:00Z

time_t(0)

time_t(0)

gmtime

1970-01-01T00:00Z

2000-01-01T00:00Z

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

using namespace std;

int main ()
{
  unsigned long int sec= time(NULL);
  cout<<sec<<endl;
}

    #include <chrono>

    ...

    using namespace std::chrono;
    int64_t timestamp = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();

#include <iostream>
#include <ctime>
#include <iomanip>

#define INFO std::cout << std::put_time(std::localtime(&time_now), \"%y-%m-%d %OH:%OM:%OS\") << \" [INFO] \" << __FILE__ << \"(\" << __FUNCTION__ << \":\" << __LINE__ << \") >> \"
#define ERROR std::cout << std::put_time(std::localtime(&time_now), \"%y-%m-%d %OH:%OM:%OS\") << \" [ERROR] \" << __FILE__ << \"(\" << __FUNCTION__ << \":\" << __LINE__ << \") >> \"

static std::time_t time_now = std::time(nullptr);

INFO << \"Hello world\" << std::endl;
ERROR << \"Goodbye world\" << std::endl;

16-06-23 21:33:19 [INFO] src/main.cpp(main:6) >> Hello world
16-06-23 21:33:19 [ERROR] src/main.cpp(main:7) >> Goodbye world