Playing around with the add method of the Calendar.

TimeTravelling.java

import java.util.Calendar;

public class TimeTravelling {
    public static void main(String[] args) {
        Calendar now = Calendar.getInstance();

        System.out.println("Greetings from the present: " + now.getTime());
        
        Calendar twoMonthsAndTeoWeeksAgo = Calendar.getInstance();
        twoMonthsAndTeoWeeksAgo.setTime(now.getTime());
        twoMonthsAndTeoWeeksAgo.add(Calendar.MONTH, -2);
        twoMonthsAndTeoWeeksAgo.add(Calendar.DATE, -14);
        
        System.out.println("Greetings from the past: " + twoMonthsAndTeoWeeksAgo.getTime());
        
        Calendar backInThePresent1 =  Calendar.getInstance();
        backInThePresent1.setTime(twoMonthsAndTeoWeeksAgo.getTime());
        backInThePresent1.add(Calendar.MONTH, 2);
        backInThePresent1.add(Calendar.DATE, 14);

        System.out.println("Attempt to get back in the present no 1: " + backInThePresent1.getTime());

        Calendar backInThePresent2 =  Calendar.getInstance();
        backInThePresent2.setTime(twoMonthsAndTeoWeeksAgo.getTime());
        backInThePresent2.add(Calendar.DATE, 14);
        backInThePresent2.add(Calendar.MONTH, 2);

        System.out.println("Attempt to get back in the present no 1: " + backInThePresent2.getTime());
    }
}