String ts = "120918 10:35:45";
SimpleDateFormat dateFormat = new SimpleDateFormat("yyMMdd hh:mm:ss");
java.util.Date parsedDate = dateFormat.parse(ts);
//parsing timestamp
Timestamp timestamp = new java.sql.Timestamp(parsedDate.getTime());
System.out.println("timestamp after parsing :: "+timestamp);

SimpleDateFormat noMilliSecondsFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(noMilliSecondsFormatter.format(timestamp));