[Q#5922004][A#5922046] How to set an expiration date in java

https://stackoverflow.com/q/5922004

I am trying to write some code to correctly set an expiration date given a certain date. For instance this is what i have. However, say if i the sign up date is on 5/7/2011 the expiration date output i get is on 11/6/2011 which is not exactly half of a year from the given date. Is there an easier way to do this?

Answer

https://stackoverflow.com/a/5922046

I would use the Calendar class - the add method will do this kind of thing perfectly. http://download.oracle.com/javase/6/docs/api/java/util/Calendar.html

APIzation

Date date = new Date();
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.add(Calendar.MONTH, 6);

            java.util.Date expirationDate = cal.getTime();

    System.err.println(expirationDate);

package com.stackoverflow.api;

import java.util.Calendar;
import java.util.Date;

public class Human5922046 {

  public static Date setExpirationDate(
    Date date,
    int calendarField,
    int amount
  ) {
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.add(calendarField, amount);

    java.util.Date expirationDate = cal.getTime();

    return expirationDate;
  }
}

package com.stackoverflow.api;

import java.util.Calendar;
import java.util.Date;

/**
 * How to set an expiration date in java
 *
 * @author APIzator
 * @see <a href="https://stackoverflow.com/a/5922046">https://stackoverflow.com/a/5922046</a>
 */
public class APIzator5922046 {

  public static void setDate() throws Exception {
    Date date = new Date();
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    cal.add(Calendar.MONTH, 6);
    java.util.Date expirationDate = cal.getTime();
    System.err.println(expirationDate);
  }
}