Java Program to display previous month from GregorianCalendar

For GregorianCalendar class, import the following package.

import java.util.GregorianCalendar;

Create an object.

GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();

Now, use the following field and add() method with a negative one (-1) to display the previous month.

cal.add((GregorianCalendar.MONTH), -1)

Example

 Live Demo

import java.util.Calendar;
import java.util.GregorianCalendar;
public class Demo {
   public static void main(String[] a) {
      GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();
      System.out.println("Current date: " + cal.getTime());
      // past month
      cal.add((GregorianCalendar.MONTH), -1);
      System.out.println("Modified date (Previous Month): " + cal.getTime());
   }
}

Output

Current date: Mon Nov 19 18:07:03 UTC 2018
Modified date (Previous Month): Fri Oct 19 18:07:03 UTC 2018