How to find Caloculate in miliseconds in java

Question

In my stock management project i want to save the time Product is saved. I want to save it in this format.
date + time(in miliseconds)

So I used this code, which is completely failed I think.

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.JLabel;

/**
*
* @author Dilini
*/
public class test {

public void Timemill(final JLabel jl) {
    new Thread(new Runnable() {
        public void run() {
            while (true) {
                DateFormat smFormat = new SimpleDateFormat("yyyyMMdd");
                Date date = new Date();
                String smday = smFormat.format(date);
                int itime = Calendar.getInstance().get(Calendar.MILLISECOND);
                jl.setText(smday + String.valueOf(itime));
            }
        }
    }).start();

 }
}

But result brings something like this.
20140530542
I know 2014=year 05=month 30=day. I can understand 542 is may be seconds. But seconds usually with 0-60. And 542 over that range.. I want to clarify what that is. Also I want to output time with more formatted way.. Thank you.

You should really read the docs for SimpleDateFormat, it even has examples! (And what is that doing in an infinite tight loop?) — Mat, May 30 '14 at 08:33
better to save it without formatting, maybe just its long value — Scary Wombat, May 30 '14 at 08:35

score 3 · Answer 1 · answered May 30 '14 at 08:35

3

I don't know what 542 is please help me.

It's the value of iTime. You're appending it...

jl.setText(smday+String.valueOf(itime));
// ...here -----^^^^^^^^^^^^^^^^^^^^^^

That value, in turn, comes from:

int itime = Calendar.getInstance().get(Calendar.MILLISECOND);

It's the milliseconds portion of the current date/time.

answered May 30 '14 at 08:35

T.J. Crowder

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I knoe it is my dear T.J. Usually when we run date it brings this format 15:04:03 but this was just 3 numbers. That's why I asked. To be honest I copy pasted this "Calendar.getInstance().get(Calendar.MILLISECOND) method. I don't have good clear idea. That's why I asked why 542 brings. – Dilini May 30 '14 at 08:41

score 3 · Accepted Answer · answered May 30 '14 at 08:35

3

Run this and you will see how you can get all parts of a Date.

    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
    System.out.println(sdf.format(new Date()));

Then use it as appropriate for your particular case.

answered May 30 '14 at 08:35

peter.petrov

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Jens · Answer 3 · 2015-07-29T07:47:02.913

-1

Use this format yyyyMMddHHmmssS For more information see the Documentation in SimpleDateFormat

H is the hour
m stand for minute
s for second
S for miliseconds.

542 are miliseconds. You get it here from the Calendar

int itime = Calendar.getInstance().get(Calendar.MILLISECOND);

Change.

         DateFormat smFormat = new SimpleDateFormat("yyyyMMdd");
            Date date = new Date();
            String smday = smFormat.format(date);
            int itime = Calendar.getInstance().get(Calendar.MILLISECOND);
            jl.setText(smday + String.valueOf(itime));

TO

            DateFormat smFormat = new SimpleDateFormat("yyyyMMddHHmmssS");
            Date date = new Date();
            String smday = smFormat.format(date);
            jl.setText(smday);

to format your date in a proper way.

edited Jul 29 '15 at 07:47

answered May 30 '14 at 08:33

Jens

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Thanks whether it is not much complex it brings me the answer. – Dilini May 30 '14 at 08:37
@paddy I have added the explanation. Hope now it is ok for you – Jens May 30 '14 at 08:49
While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Pawan Rai Feb 09 '15 at 08:02
@pawan the essential parts are copied see the explanation for the placeholder. – Jens Feb 09 '15 at 08:05
@DavidPostill Have changed my answer. – Jens Feb 09 '15 at 08:22

How to find Caloculate in miliseconds in java

3 Answers3