Java Program To Get Days Between Two Dates

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import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class JavaDaysBetweenDates {
	
	public static void main(String args[]){
		
		int days = getDaysBetween(new Date("01 Jan 2015"),new Date("31 Jan 2015"));
		
		System.out.println("No of Days : "+days);
		
	}
	
    public static int getDaysBetween(java.util.Date date1, java.util.Date date2) {

        if (date1 == null || date2 == null) {
            return -1;
        }

        GregorianCalendar gregorianCalendar1 = new GregorianCalendar();
        gregorianCalendar1.setTime(date1);

        GregorianCalendar gregorianCalendar2 = new GregorianCalendar();
        gregorianCalendar2.setTime(date2);


        if (gregorianCalendar1.get(Calendar.YEAR) == gregorianCalendar2.get(Calendar.YEAR)) {
            return Math.abs(gregorianCalendar1.get(Calendar.DAY_OF_YEAR) - gregorianCalendar2.get(Calendar.DAY_OF_YEAR));
        }

        long time1 = date1.getTime();
        long time2 = date2.getTime();
        long days = (time1 - time2) / (1000 * 60 * 60 * 24);

        return Math.abs((int)days);
    }
}

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