Digital Clock in c++

#include <ctime>
#include <iostream>
#include <windows.h>


int main()
{
    using std::cin;

    bool loop = true;


    while (loop)
    {


  std::time_t now = std::time ( 0 );
  std::tm *local = std::localtime ( &now );

  local->tm_hour -= 6;
  
  system("cls");
  std::cout << ctime ( &now ) <<'\n';
  Sleep(1000);
  
    }
  cin.get();

  return 0;


}