/* package whatever; // don't place package name! */

/* The class name doesn't have to be Main, as long as the class is not public. */
class Main
{
  public static void main (String[] args) throws java.lang.Exception
  {
    String date = "2012-11-28 12:30:30";
    date = date.substring(0, 14) + "00:00";
    System.out.println(date);
  }
}