datemodifier

package methodsExercises.pr10DateModifier;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Pr10DateModifier {

    public static void main(String[] args) {
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));){
            String startDate = reader.readLine();
            String endDate = reader.readLine();
            DateModifier date = new DateModifier();

            date.calcDifference(startDate, endDate);
            System.out.println(date.getDiference());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}
package methodsExercises.pr10DateModifier;

import java.util.Calendar;

 class DateModifier {

    private long diference;

    public DateModifier() {
        this.diference = 0L;

    }

    public Long getDiference() {
        return diference;
    }

    public void calcDifference(String startDate, String endDate){
        String[] tokensStart = startDate.split("\\s+");
        int startYear  = Integer.parseInt(tokensStart[0]);
        int startYMonth  = Integer.parseInt(tokensStart[1]);
        int startDay  = Integer.parseInt(tokensStart[2]);

        Calendar start = Calendar.getInstance();
        start.set(startYear, startYMonth, startDay);

        String[] tokensEnd = endDate.split("\\s+");
        int endYear  = Integer.parseInt(tokensEnd[0]);
        int endYMonth  = Integer.parseInt(tokensEnd[1]);
        int endDay  = Integer.parseInt(tokensEnd[2]);

        Calendar end = Calendar.getInstance();
        end.set(endYear, endYMonth, endDay);

        long startDateMilliSeconds = start.getTimeInMillis();
        long endDateMilliSeconds = end.getTimeInMillis();
        this.diference = Math.abs((endDateMilliSeconds - startDateMilliSeconds)/(24 * 60 * 60 * 1000));
    }
}