java.util.Date and java.util.Calendar

1. Getting last day of a month:
   //The first month of the year in the Gregorian and Julian calendars is JANUARY which is 0;
   int month = 1; //So 1 wil l be FEBRUARY
   Calendar c = Calendar.getInstance();
   c.set(Calendar.MONTH, month);
   c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
   java.util.Date maxDateInMonth = c.getTime();
   
   
2. Formatting date as String:
   java.util.Date myDate = new java.util.Date();
   java.text.SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
   //For others patterns click here
   String formattedDate = null;
   try {
   formattedDate = sdf.format(myDate);
   } catch (Exception e) {
   e.printStackTrace();
   }
   
   
3. Change String format of a date:
   String strDate = "2008-10-11";
   SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
   SimpleDateFormat sdf2 = new SimpleDateFormat("dd/MM/yyyy");
   String converted = null;
   try {
   converted = sdf2.format( sdf1.parse(date) );
   // converted will be "10/11/2008"
   } catch (Exception e) {
   e.printStackTrace();
   }