Kalendar na nastani

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.stream.Collectors;

public class EventCalendarTest {
    public static void main(String[] args) throws ParseException {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        scanner.nextLine();
        int year = scanner.nextInt();
        scanner.nextLine();
        EventCalendar eventCalendar = new EventCalendar(year);
        DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm");
        for (int i = 0; i < n; ++i) {
            String line = scanner.nextLine();
            String[] parts = line.split(";");
            String name = parts[0];
            String location = parts[1];
            Date date = df.parse(parts[2]);
            try {
                eventCalendar.addEvent(name, location, date);
            } catch (WrongDateException e) {
                System.out.println(e.getMessage());
            }
        }
        Date date = df.parse(scanner.nextLine());
        eventCalendar.listEvents(date);
        eventCalendar.listByMonth();
    }
}

class EventCalendar {
    List<Event> eventList;
    int godina;

    public EventCalendar(int godina) {
        this.godina = godina;
        eventList = new ArrayList<>();
    }
    public void addEvent(String name,String location,Date date) throws WrongDateException {
        if(date.getYear() != godina - 1900){
            throw new WrongDateException("Wrong date: " + date.toString().replace("GMT", "UTC"));
        }
        else {
            eventList.add(new Event(name,location,date));
        }
    }
    public void listEvents(Date date){
        List<Event> tmp;
        tmp = eventList.stream().filter(event -> event.getDate().getDay() == date.getDay()&&event.getDate().getMonth() == date.getMonth()&&event.getDate().getTime() >= date.getTime())
                .sorted(Event::compareTo).collect(Collectors.toList());
        if(tmp.isEmpty())
            System.out.println("No events on this day!");
        else {
            tmp.forEach(System.out::println);
        }
    }
    public void listByMonth(){
        Map<Integer,Integer> nastani = new HashMap<>();
        for(int i = 1; i<13; i++){
            nastani.put(i,0);
        }
        eventList.forEach(event -> nastani.computeIfPresent(event.getDate().getMonth()+1,(k,v) -> v+1));
        nastani.forEach((key,value) -> System.out.println(key + " : " + value));
    }
}
class Event implements Comparable<Event>{
    String ime;
    String lokacija;
    Date date;

    public Event(String ime, String lokacija, Date date) {
        this.ime = ime;
        this.lokacija = lokacija;
        this.date = date;
    }

    @Override
    public int compareTo(Event o) {
        int s = Long.compare(this.date.getTime(),o.date.getTime());
        if(s == 0)
            return this.ime.compareTo(o.ime);
        return s;
    }

    public Date getDate() {
        return date;
    }
    @Override
    public String toString() {
        DateFormat df = new SimpleDateFormat("dd MMM, yyy HH:mm");
        return String.format("%s at %s, %s", df.format(date), lokacija, ime);
    }
}
class WrongDateException extends Exception{
    public WrongDateException(String message) {
        super(message);
    }

    @Override
    public String getMessage() {
        return super.getMessage();
    }
}