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

#define BAD_TIME ( (time_t) -1 )

main()
{
time_t t_time;
struct tm t;

t.tm_sec = 0;
t.tm_min = 15;
t.tm_hour = 7;
t.tm_mday = 4;
t.tm_mon = 4;
t.tm_year = 102;

t_time = mktime(&t);
if ( BAD_TIME == t_time )
  cerr << "oops\n";
else
  cout << t.tm_mon+1 << "/" << t.tm_mday << "/" << t.tm_year+1900;
  cout << " @ " << t.tm_hour << ":" << t.tm_min << " = " << t_time << endl;

// ======================================= //

t_time = 1031503500;
cout << t_time << " converts to " << ctime(&t_time);
}