Формат даты и времени

const char* TimeInfo()
{
    time_t rawtime;
    struct tm* timeinfo;
 
    time (&rawtime);
    timeinfo = localtime(&rawtime);
 
    return asctime(timeinfo);
}

const char* TimeInfo()
{
    char str[256];
    SYSTEMTIME systime;
    GetLocalTime(&systime);
    sprintf(str, "%02d.%02d.%d-%d:%d:%02d", systime.wDay, systime.wMonth, systime.wYear, systime.wHour, systime.wMinute, systime.wSecond);
    return str;
}

std::string TimeInfo() {
    char str[256] = {0};
    time_t tm = std::time(NULL);
    std::strftime(str, sizeof(str), "%d.%m.%Y-%H:%M:%S", std::localtime(&tm));
    return std::string(str);
}

char* TimeInfo()
{
    static char str[20] = {NULL};
    memset(&str, 0, sizeof(str));
    SYSTEMTIME systime;
    GetLocalTime(&systime);
    sprintf(str, "%02d.%02d.%d-%d:%d:%02d", systime.wDay, systime.wMonth, systime.wYear, systime.wHour, systime.wMinute, systime.wSecond);
    return str;
}

char* TimeInfo()
{
    static char str[20] = {NULL};
    time_t tm = time(NULL);
        strftime(str, sizeof(str), "%d.%m.%Y-%H:%M:%S", localtime(&tm));
    return str;
}

#include <ctime>
#include <iostream>
using namespace std;
 
int main(){
    time_t t = time(0);
    tm * ptm = localtime(&t);
    
    return 0;
}

#include <ctime>
#include <iostream>
using namespace std;
 
int main(){
    time_t t = time(0);
    tm * ptm = localtime(&t);
    cout << ptm->tm_hour << ":" << ptm->tm_min << ":" << ptm->tm_sec << endl;
    return 0;
}