Something

//pseudocode!
int time;
while(time = file.read() )
{
  bool isAm = true;
  if(time >=1200)
        isAm = false;
  if(time >=1300)
        time-=1200;
  print time;
  if(am)
    print "am\n";
  else
    print "pm\n";
    
}