#include <ctime>
#include <cstdlib>
#include <iostream>
#include <limits>

using namespace std;

void
print_time (ostream& os, const time_t& t)
{
	struct tm* time = localtime (&t);
	os << t << "=";
	if (!time)
			os << "(null)";
	else
		{
		char buf[20];
		strftime (buf, sizeof (buf), "%Y-%m-%d %H:%M:%S", time);
		os << buf;
		}
	os << "\n";
}

int
main ()
{
	print_time (cout, 0);
	print_time (cout, time (0));
	print_time (cout, -1);
	print_time (cout, numeric_limits<int>::min ());
	print_time (cout, numeric_limits<int>::max ());
	print_time (cout, numeric_limits<time_t>::min ());
	print_time (cout, numeric_limits<time_t>::max ());

	return EXIT_SUCCESS;
}