c-library time-point, C++ (vc++)

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#include <iostream>
#include <chrono>
#include <limits>
#include <ctime>
#include <cstring>

void show_cal_time( std::time_t t )
{
    std::cout << "numeric value of t: " << t << "\nc-library calendar time: " ;
    errno = 0 ;
    const auto ct = std::ctime( std::addressof(t) ) ;
    if( errno ) std::cout << "*** error: " << std::strerror(errno) << '\n'  ;
    else std::cout << ct << '\n' ;
    
    // linux: print it anyway (with linux we get spurious/misleading errors; however, some printable 
    //                        characters are placed into the buffer even on a genuine error)
    #ifdef __linux__
        std::cout << ct << '\n' ;  
    #endif // __linux__
}

int main()
{
    std::cout << "C++ min time_point\n-------------\n" ;
    show_cal_time( std::chrono::system_clock::to_time_t( std::chrono::system_clock::time_point::min() ) ) ;

std::cout << "\nC++ max time_point\n-------------\n" ;
    show_cal_time( std::chrono::system_clock::to_time_t( std::chrono::system_clock::time_point::max() ) ) ;

std::cout << "\nC++ current time_point\n-------------\n" ;
    show_cal_time( std::chrono::system_clock::to_time_t( std::chrono::system_clock::now() ) ) ;
}

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Compilation time: 2,19 sec, absolute running time: 0,47 sec, absolute service time: 2,68 sec