subtracting or adding two dates.

My question is very simple. How to add or subtract two dates in java.

I  would also like to know how to validate dates. considering I am accepting the  dateinput from a text field

Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

To add date2 to date1 do this:

date1.setTime( date1.getTime() + date2.getTime() );

To format a date from text use this:

import java.util.Date;
import java.text.SimpleDateFormat;

public class tt {
    public static void main(String args[]) {
        Date d =null;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm");
            d = sdf.parse("23/12/1999 10:00");
        } catch (Exception e) {
            System.out.println("Error: " + e);
        try { Thread.sleep(2000); } catch (Exception e) {}

SimpleDateFormat allows you to specify the format of the date you wish to accept. Change the format you specify here to adjust this:

new SimpleDateFormat("dd/MM/yyyy HH:mm")


new SimpleDateFormat("MM/dd/yyyy HH:mm")



Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.