Guardian of Time

package guardianOfTime;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Duration;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Scanner;

public class GuardianOfTime {
    public static void main(String[] args) throws ParseException {
        Scanner scanner = new Scanner(System.in);

        String[] input = scanner.nextLine().split(";");


        String startHour = input[0].substring(11, 13);
        String startMinutes = input[0].substring(14, 16);

        String endHour = input[1].substring(11, 13);
        String endMinutes = input[1].substring(14, 16);

        int hourStart = Integer.parseInt(getnum(startHour));
        int minutesStart = Integer.parseInt(getnum(startMinutes));

        int hourEnd = Integer.parseInt(getnum(endHour));
        int minutesEnd = Integer.parseInt(getnum(endMinutes));


        int hour = 0;

        int momentMinutes = hourStart * 60 + minutesStart;

        String dataStart = input[0].substring(0, 10).substring(0, 10);
        String dataEnd = input[1].substring(0, 10).substring(0, 10);

        String dt = dataStart;  // Start date
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(sdf.parse(dt));


        long day = getDays(input[0], input[1]);

        for (int i = 0; i < day; i++) {
            if (i == 0) {
                hour += (1440 - momentMinutes);
                c.add(Calendar.DATE, 1);  // number of days to add
                dt = sdf.format(c.getTime());
                System.out.print(input[0] + " - " + dt + " 00:00:00 ");
                System.out.println(hour);
            } else {
                hour += 1440;
                c.add(Calendar.DATE, i - 1);  // number of days to add
                dt = sdf.format(c.getTime());
                System.out.print(dt + " 00:00:00 - ");
                c.add(Calendar.DATE, i);  // number of days to add
                dt = sdf.format(c.getTime());
                System.out.print(dt + " 00:00:00 ");
                System.out.println(1440);
            }
        }
        int momentEndMinutes = hourEnd * 60 + minutesEnd;

        if (day == 0) {
            hour = momentEndMinutes - momentMinutes;
            System.out.print(input[0] + " - " + input[1] + " ");
            System.out.println(hour);

        } else {
            hour += momentEndMinutes;
            int beforeDay = (int) day - 2;
            c.add(Calendar.DATE, beforeDay);  // number of days to add
            dt = sdf.format(c.getTime());
            System.out.print(dt + " 00:00:00 - " + input[1] + " ");
            momentMinutes = hourEnd * 60 + minutesStart;
            System.out.println(momentMinutes);


        }


        System.out.println(hour);
    }

    private static long getDays(String start, String end) {
        String dataStart = start.substring(0, 10);
        String dataEnd = end.substring(0, 10);
        LocalDate d1 = LocalDate.parse(dataStart, DateTimeFormatter.ISO_LOCAL_DATE);
        LocalDate d2 = LocalDate.parse(dataEnd, DateTimeFormatter.ISO_LOCAL_DATE);
        Duration diff = Duration.between(d1.atStartOfDay(), d2.atStartOfDay());
        long diffDays = diff.toDays();

        return diffDays;
    }


    private static String getnum(String data) {
        String num = data;
        if (data.startsWith("0")) {
            num = data.substring(1);
        }
        return num;
    }
}