Java Date get days between two String date values

import java.text.ParseException;
import java.text.SimpleDateFormat;

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

public class Main {
    public static void main(String[] argv) throws Exception {
        String date1 = "2020-02-03";
        String date2 = "2010-02-03";
        System.out.println(daysBetween(date1, date2));
    }/*from w  w  w.ja v a 2s.c o m*/

    public static int daysBetween(String date1, String date2) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        if (date1 == null || date1.trim().length() == 0 || date2 == null || date2.trim().length() == 0) {
            return 0;
        }
        Date smdate = sdf.parse(date1);
        Date bdate = sdf.parse(date2);
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days = (time2 - time1) / (1000 * 3600 * 24);

        return Integer.parseInt(String.valueOf(between_days));
    }
}