Java Tutorial : Java IO (Java File - How to Change the file last modified date) ~ foundjava

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FileDemo.java

import java.io.File;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;

public class FileDemo
{

    public static void main(String[] args) throws IOException, ParseException
    {
        File file = new File("D:/work/myfile.txt");

        long lastModified = file.lastModified();
        System.out.println("Before Format : " + lastModified);

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
                "MM/dd/yyyy HH:mm:ss");

        String formatedStr = simpleDateFormat.format(lastModified);
        System.out.println("After Format,old lastModified : " + formatedStr);

        /*
         * Sets the last-modified time of the file or
         * directory named by this abstract pathname.
         */
        file.setLastModified(System.currentTimeMillis());

        lastModified = file.lastModified();
        formatedStr = simpleDateFormat.format(lastModified);
        System.out.println("After Format,new lastModified : " + formatedStr);
    }

}

Output

Before Format : 1477195340491
After Format,old lastModified : 10/23/2016 09:32:20
After Format,new lastModified : 10/23/2016 09:34:20

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