Sample 4. Method to get Date after n days using Calendar
Date getDateAfterDays(int numberOfDays){
Calendar futureDate = Calendar.getInstance();
futureDate.setTime(new Date()); // Set Current Date
futureDate.add(Calendar.DATE, numberOfDays); // Add n days to current Date
Date getDateTimeAfterNHours(int numberOfHours){
Calendar futureTime = Calendar.getInstance();
futureTime.setTime(new Date()); // Set Current Date
futureTime.add(Calendar.HOUR, numberOfDays); // Add n hours to current Date and Time