Help on java.io.File

Question

I need to know the time stamp of a file like "HelloWorld.java" or "ReadMe.txt".
-My application requires to delete all those ".txt" files that's One-Day old. How will I know if that file is 1 day old????
-cant find any methods on java.io.File in regards with that.
any ideas/help would be greatly appreciated.
Thanks

Answer 1

Again, here's my problem, i dont know what's wrong with my code but everytime I check for a file, the entire date (year, month, day, hour,min, sec) is completely dead wrong...
it always prints the year into 1970 instead of 2006...
below is my a portion of my code:
try {     
              ResourceBundle rs=ResourceBundle.getBundle("directory");
             String directory=rs.getString("dir");     
               File fileDirectory=new File(directory+"/");
               File file=null;
               String listFiles[]=fileDirectory.list();
               for (int i = 0; i<listFiles.length; i++){
                    System.out.println (listFiles);
                    file=new File(listFiles[i]);
                    //get file's date stamp
               long dateStamp=file.lastModified();
               GregorianCalendar dateOfFile=new GregorianCalendar();
               dateOfFile.setTime(new Date(dateStamp));
// it prints here 1970.... Why????          
     System.out.println ("year: "+ dateOfFile.get(Calendar.YEAR));
     System.out.println ("Month: "+ dateOfFile.get(Calendar.MONTH));
     System.out.println ("day: "+dateOfFile.get(Calendar.DAY_OF_MONTH));
     System.out.println ("Hour: "+dateOfFile.get(Calendar.HOUR_OF_DAY));
     System.out.println ("Min: "+dateOfFile.get(Calendar.MINUTE));
     System.out.println ("Sec: "+dateOfFile.get(Calendar.SECOND));