得到当前时间

1.  Calendar.getInstance().getTime();

2.  new Timestamp(System.currentTimeMillis());

3.  new Timestamp((Calendar.getInstance().getTime()).getTime());

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date

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

//Calendar

Date date = Calendar.getInstance().getTime();

System.out.println(df.format(date));

//Timestamp

System.out.println(df.format(new Timestamp(System.currentTimeMillis())));

System.out.println(df.format(new Timestamp(date.getTime())));

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rs.getTimestamp("ORIGINAL_RESPONSE_DATETIME");

Calendar c = Calendar.getInstance();

c.setLenient(false);

c.set(year, month-1, day, hour, minutes, 0);

c.set(Calendar.MILLISECOND, 0);

c.setTime(date);

c.add(Calendar.MONTH, n);  //在日期上增加数个整月

new Timestamp(c.getTime().getTime());