Java 毫秒轉日期

public static void main(String[] args) throws SQLException, ClassNotFoundException, ParseException {
     String x = "1304638584000";
     long l = new Long(x).longValue();
     System.out.println("Long value: " + l);
     Calendar c = new GregorianCalendar();
     c.setTimeInMillis(l);  
     String origDate =
     c.get(Calendar.YEAR) + "-" +
     c.get(Calendar.MONTH) + "-" +
(c.get(Calendar.MONTH)+1)+ "-" +  +" " +
     c.get(Calendar.HOUR)+":"+c.get(Calendar.MINUTE)+":"+c.get(Calendar.SECOND)
     ;
     System.out.println("Date in YYYY-MM-DD format: " + origDate);
    }