How to use Java to get the current time and the day before

1. Get the current time

Ruby Code

1. Calendar cal = Calendar.getinstance ();
2. String Time=formatter.format (Cal.gettime ());
3. String strend=time.substring (0, 16);//2007-10-30 09:30

2. Get the day before

Ruby Code

1. Calendar C = calendar.getinstance ();
2. C.add (Calendar.day_of_month,-1);
3. SimpleDateFormat formatter = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");
4. String Mdatetime=formatter.format (C.gettime ());
5. String strstart=mdatetime.substring (0, 16);//2007-10-29 09:30

3. Get the time of the previous days

Ruby Code

1. Calendar C = calendar.getinstance ();
2. C.add (Calendar.day_of_month,-5);//Get Top 5
3. SimpleDateFormat formatter = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");
4. String Mdatetime=formatter.format (C.gettime ());
5. String strstart=mdatetime.substring (0, 16);//2007-10-24 09:30

4. Get the time of the previous years of the current time

Ruby Code

1. Calendar C = calendar.getinstance ();
2. C.add (Calendar.year,-5);//Get the first 5 years
3. SimpleDateFormat formatter = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");
4. String Mdatetime=formatter.format (C.gettime ());
5. String strstart=mdatetime.substring (0, +);//2002-10-24 09:30

From: http://heiwuya.iteye.com/blog/294174

How to use Java to get the current time and the day before