How to Add or Subtract Minutes from a Date

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This code example shows how to add and remove minutes from a date using an instance of the Calendar class.
The method incrementMinutes takes two parameters, the Calendar object and the number of minutes to add.
The method decrementMinutes takes the same parameters and decrement the Calendar object with the number of minutes passed to it.
Note that the actuall call to the calendar is to the same method, add(), but when decrementing a negative value is passed.

The main method creates a Calendar object and print out the current date / time.
Then it instantiates a new Main object and call both methods with the calendar instance as parameter along with the number of minutes.

import java.util.Calendar;

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

    public void incrementMinutes(Calendar cal, int minutes) {

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

    public void decrementMinutes(Calendar cal, int minutes) {

        cal.add(Calendar.MINUTE, minutes);
        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.incrementMinutes(cal, 5);
        main.decrementMinutes(cal, -10);
    }
}

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