Java Calculate Number of Milliseconds Between Two Date

import java.util.Date;

public class DateUtil {

    /**
     * This method to get number of milliseconds between two Date objects.
     * @param start the start Date object
     * @param end the end Date object
     * @return the number of milliseconds between start and end Date.
     */
    public static long getNumberOfMillisecondsBetween(Date start, Date end) {
        long numberOfMilliseconds = end.getTime() - start.getTime();
        return numberOfMilliseconds;
    }

}

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

public class NumberOfMillisecondsBetweenDateExample {
    public static void main(String... args) {
        Date startDate = new GregorianCalendar(2022, Calendar.JULY, 1, 8, 30, 0).getTime();
        Date endDate = new GregorianCalendar(2022, Calendar.JULY, 1, 8, 31, 0).getTime();

        // Calculate Number of Milliseconds Between Two Date objects
        long numberOfMilliseconds = DateUtil.getNumberOfMillisecondsBetween(startDate, endDate);

        System.out.println("Start Date: " + startDate);
        System.out.println("End Date: " + endDate);
        System.out.println("Number of milliseconds: " + numberOfMilliseconds);
    }
}

Start Date: Fri Jul 01 08:30:00 ICT 2022
End Date: Fri Jul 01 08:31:00 ICT 2022
Number of milliseconds: 60000