Calendar calendat = Calendar.getInstance();

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

 String dateStr = sdf.format(calendar.getTime());

 String str="2012-5-27";

 SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

 Date date =sdf.parse(str);

 Calendar calendar = Calendar.getInstance();

 calendar.setTime(date);

 SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

 String dateStr=sdf.format(new Date());

 String str="2012-5-27";

 SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");

 Date date= sdf.parse(str);

 Calendar calendar = Calendar.getInstance();

 calendar.setTime(new java.util.Date());

 Calendar calendar = Calendar.getInstance();

 java.util.Date date =calendar.getTime();

 Timestamp ts = Timestamp.valueOf("2012-1-14 08:11:00");

 SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

 String time = df.format(new Date());

 Timestamp ts = Timestamp.valueOf(time);