Increment and Decrement a Date Using the Calendar Class

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This code example shows how to increment and decrement a date using an instance of the Calendar class.
The first method, incrementDate, increments the Calendar which is passed to the method by 5 days.
The second method, decrementDate, decrements the same Calendar instance with one month.

import java.util.Calendar;

/**
*
* @author www.javadb.com
*/
public class Main {

    public void incrementDate(Calendar cal) {

        int daysToIncrement = 5;

        cal.add(Calendar.DATE, daysToIncrement);
        System.out.println("Date after increment: " + cal.getTime());
    }

    public void decrementDate(Calendar cal) {

        int monthsToDecrement = -1;
        cal.add(Calendar.MONTH, monthsToDecrement);
        System.out.println("Date after decrement: " + cal.getTime());

    }
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        Calendar cal = Calendar.getInstance();
        System.out.println("Now : " + cal.getTime());
        Main main = new Main();
        main.incrementDate(cal);
        main.decrementDate(cal);
    }
}

Since both the increment and decrement methods are called with the same instance of the Calendar class, the output from the code example showed this when it was executed:

Now : Wed Oct 01 18:15:15 CEST 2008
Date after increment: Mon Oct 06 18:15:15 CEST 2008
Date after decrement: Sat Sep 06 18:15:15 CEST 2008

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