Simple question - How to find date

Question

Hi Experts,
I have a simple question on date. Suppose today is Jan 4, 2010. I have to find out Jan 1, 2007 using Java code.
I have used following code. This code will work for 2010 and 2011 properly. However it won't work properly after Feb 28, 2012. Please see "dayInMillis*1096 " portion of code. Here 365365366 = 1096.
How I can avoid this hard coding. Do we have any simple way to get Jan 1, 2007 even without using following code.
     Calendar calendar = Calendar.getInstance();
     int lastDate = calendar.getActualMaximum(Calendar.DATE);
     int firstDate = calendar.getActualMinimum(Calendar.DATE);
     int todayDate = calendar.get(Calendar.DATE);
     int dayofyear = calendar.get(Calendar.DAY_OF_YEAR);
     java.sql.Date currentdate = new java.sql.Date(System.currentTimeMillis());
     long dayInMillis = 1000 * 60 * 60 *24; //1 day
     wdContext.currentContextElement().setFromDate(new Date(System.currentTimeMillis() - dayInMillis*1096 - ((dayofyear-1)*dayInMillis)));
Please help.
Regards,
Gary

Answer 1

Hi Gary,
I am not pretty much clear with your question, whatever i have understood, i have found a way to get the previous date given the current date.
Below is the code for the same.
                       Calendar now = Calendar.getInstance();//Jan 4, 2010
       String nowDateStr = DateFormat.getDateInstance().format(now.getTime());
       System.out.println("date now : " +nowDateStr);
       now.add(Calendar.YEAR, -3);//2007
       now.add(Calendar.DATE, -3);//1st
       now.add(Calendar.MONTH, 0);//No change in month, Jan.
       String changedDateStr = DateFormat.getDateInstance().format(now.getTime());
       System.out.println("date changed : " +changedDateStr);