Dealing with Date in Java:

Get days between two dates:

public static long getDaysBetween(Calendar startDate, Calendar endDate) { 

Calendar date = (Calendar) startDate.clone(); 

      long daysBetween = 0; 

      while (date.before(endDate)) { 

          date.add(Calendar.DAY_OF_MONTH, 1); 

          daysBetween++; 

       } 

       return daysBetween; 

} 

Convert String to Calendar Date Format:

public static Calendar convertStringToCalendarDate(String newDate) {

      Date newParsedDate = new Date();

      //DateFormat dfd = DateFormat.getDateInstance();            DateFormat dfd = new SimpleDateFormat("dd-MM-yyyy");

      try {

           newParsedDate = dfd.parse(newDate);

           System.out.println(newParsedDate);

       }

      catch(ParseException e) {

              System.out.println("Unable to parse " + newParsedDate);

        }

       Calendar cal = Calendar.getInstance();

       cal.setTime(newParsedDate);

           

      return cal;

}

Get the last date of current year (but hard-coding the day and month):

SimpleDateFormat yearFormat = new SimpleDateFormat("yyyy");

           

Calendar endDateOfYear = Calendar.getInstance();

endDateOfYear.set(Calendar.YEAR, Integer.parseInt(yearFormat.format(Calendar.getInstance().getTime())));

endDateOfYear.set(Calendar.MONTH, 11); // 11 = December

endDateOfYear.set(Calendar.DAY_OF_MONTH, 31);

Converting Date to String:

Date now = new Date();

DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT);

String s = df.format(now);

System.out.println("Today is " + s);

Addition of dates in Calendar date:

GregorianCalendar warranty = new GregorianCalendar(2012, Calendar.DECEMBER, 9);

warranty.add(GregorianCalendar.DATE, 30);

Date d = warranty.getTime();

String ss = dfc.format(d);

System.out.println("30 days warranty will end on" + ss);