Develop technology - get time 10 minutes ago

SimpleDateFormat： Used for date formatting

Calendar： For time operation

Date： Used to get the time

java Date formatting -- SimpleDateFormat Use . String to date , Date to string ​​​​​​

Java Calendar Calendar time operation Timestamp Date Calendar transformation

 Java.Utils：Date Time tools f

Code 1：

        // SimpleDateFormat  Date formatting 
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar rightNow = Calendar.getInstance();
        Date dt = new Date();
        System.out.println(" current time ---" + sdf.format(dt));
        rightNow.setTime(dt);

        rightNow.add(Calendar.MINUTE, -10);
        Date dt2 = rightNow.getTime();
        String format = sdf.format(dt2);
        System.out.println(" Ten minutes less ---" + format);

  Code 2：

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date now = new Date();
        System.out.println(" current time ---" + sdf.format(now));
        //  The number of milliseconds in ten minutes 
        // long time = 10 * 60 * 1000;
        //  Nine and a half milliseconds 
        long time = 570000;
        Date beforeDate = new Date(now.getTime() - time);
        System.out.println(" Nine and a half minutes ago ---" + sdf.format(beforeDate));

Code 1 Only integer function can be realized , Code 2 More flexible