To go into the past: making the second argument negative in the 'add' method : Gregorian Calendar « Data Type « Java Tutorial

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

public class MainClass {
  public static void main(String[] a) {
    GregorianCalendar calendar = new GregorianCalendar();
    calendar.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
    calendar.add(Calendar.YEAR, -14); 
    System.out.println(calendar.get(Calendar.YEAR));
  }
}

2.40.Gregorian Calendar
	2.40.1.	Creating Gregorian Calendars
	2.40.2.	Specifying the locale(TimeZone) explicitly for Gregorian Calendar
	2.40.3.	Creating a Calendar object from a locale
	2.40.4.	Creating a Date Object for a Particular Date
	2.40.5.	Setting the Date and Time
	2.40.6.	Setting a GregorianCalendar object to a particular date
	2.40.7.	Integer constants for the third version of set()
	2.40.8.	Calendar.DAY_OF_WEEK
	2.40.9.	Set with GregorianCalendar.YEAR, MONTH and DATE
	2.40.10.	Getting Date and Time Information: get the day of the week
	2.40.11.	Using a switch statement on the values for day
	2.40.12.	Modifying Dates and Times: adding 14 to the year
	2.40.13.	To go into the past: making the second argument negative in the 'add' method
	2.40.14.	To increment or decrement a field of a calendar by 1 using the roll() method
	2.40.15.	Comparing Calendars
	2.40.16.	Displaying Date by weekday name
	2.40.17.	Printing out weekday names
	2.40.18.	Determine the day of the week