Here is an example showing the Data addition and subtraction using Calendar in Java.

import java.util.Calendar;

public class DateAdditionAndSubtraction {

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

    System.out.println("Today : " + cal.getTime());

    // Subtract 30 days from the calendar
    cal.add(Calendar.DATE, -30);
    System.out.println("30 days ago: " + cal.getTime());

    // Add 10 months to the calendar
    cal.add(Calendar.MONTH, 10);
    System.out.println("10 months later: " + cal.getTime());

    // Subtract 1 year from the calendar
    cal.add(Calendar.YEAR, -1);
    System.out.println("1 year ago: " + cal.getTime());
  }
}

Done =)

Reference: Kodejava – How do I do a date add or subtract?