How to Calculate 30 days minus Today's Date?

[James Dekker]

Am trying to figure out how to create a mechanism which will:

1. Compute today's date.

2. Minus it by 30 days (based on a String const that is placed in an inner class)?

Here's my constant:

public class Constants {
     public static class DayParameter {
        public static final String COUNT_OF_DAYS = "30";
    }
}

Here's my calling code:

Calendar calendar = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
dateFormat.format(calendar.getTime());

// This outputs: 05/24/2011
System.out.println("Today: " + dateFormat.format(calendar.getTime()));
    
// How do something like this (notice the minus sign):
cal.add(Calendar.DAY_OF_MONTH, - Constants.DayParameter.COUNT_OF_DAYS);
Date thirtyDaysFromNow = cal.getTime();

Am confused as my requirement is to use a constant parameter which is String?

Thank you for taking the time to read this...

[Maneesh Godbole]

Am confused as my requirement is to use a constant parameter which is String?

You will need to construct(hint) an Integer(hint) from the string constant, so you can use it in the add method

[Divya Janyavula]

[mg]edited out solution

[Maneesh Godbole]

Divya,
Welcome to the Ranch. I had to edit out your post because

We're all here to learn, so when responding to others, please focus on helping them discover their own solutions, instead of simply providing answers.

[Divya Janyavula]

Was not aware. Thanks for that