Date to String and String to Date Error Java

Question

I am changing my date to String and again from string to date but the date after converting from string to date is different than before .See the Code

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

import javax.swing.JOptionPane;

public class DateChange {

public static void main(String[] args) {

    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/YYYY");
    Date date = new Date();
    String dateString = dateFormat.format(date);

    Date currentDate = null;
    try {

        currentDate = dateFormat.parse(dateString);

        System.out.println(date + " \n" + currentDate);

    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

}

Here if date object has value Mon Sep 04 12:51:33 IST 2017

Than currentDate has Sun Jan 01 00:00:00 IST 2017

I know something is wrong with the code and I am unable to figure it out.So please point it out for me.

Thanks

What version of Java is that? If Java 8 or more, consider using the new datetime API — fge, Sep 04 '17 at 07:26
FYI, you are using troublesome old date-time classes now supplanted by the java.time classes. — Basil Bourque, Sep 04 '17 at 07:37
Related: [SimpleDateFormat producing wrong date time when parsing “YYYY-MM-dd HH:mm”](https://stackoverflow.com/questions/15916958/simpledateformat-producing-wrong-date-time-when-parsing-yyyy-mm-dd-hhmm) — Ole V.V., Sep 04 '17 at 07:59
As an aside, I recommend you scrap the long outdated classes `SimpleDateFormat` and `Date`. Lots of people have experienced lots of problems with them, your is just one in a seemingly neverending row. Today we have so much better in [the modern Java date & time API](https://docs.oracle.com/javase/tutorial/datetime/). — Ole V.V., Sep 04 '17 at 09:29

score 2 · Accepted Answer · answered Sep 04 '17 at 07:27

2

You're using a wrong format. By checking the documentation you can see that

d: day in month
M: month in year
Y: week year
y: year

So the correct format would be: "dd/MM/yyyy"

answered Sep 04 '17 at 07:27

Alberto S.

7,409
6
27
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Thanks. This silly mistake took my 3 hours. – Ayush Goyal Sep 04 '17 at 08:43

score 1 · Answer 2 · answered Sep 04 '17 at 07:27

1

Your format String is incorrect. You've used YYYY, but you need yyyy. Like,

SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");

answered Sep 04 '17 at 07:27

Elliott Frisch

198,278
20
158
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Date to String and String to Date Error Java

2 Answers2