Determine file creation date in Java

Question

There is another similar question to mine on StackOverflow (How to get creation date of a file in Java), but the answer isn't really there as the OP had a different need that could be solved via other mechanisms. I am trying to create a list of the files in a directory that can be sorted by age, hence the need for the file creation date.

I haven't located any good way to do this after much trawling of the web. Is there a mechanism for getting file creation dates?

BTW, currently on a Windows system, may need this to work on a Linux system as well. Also, I can't guarantee that a file naming convention would be followed where the creation date/time is embedded in the name.

Answer 1

Java nio has options to access creationTime and other meta-data as long as the filesystem provides it. Check this link out

For example (provided based on @ydaetskcoR's comment):

Path file = ...;
BasicFileAttributes attr = Files.readAttributes(file.toPath(), BasicFileAttributes.class);

System.out.println("creationTime: " + attr.creationTime());
System.out.println("lastAccessTime: " + attr.lastAccessTime());
System.out.println("lastModifiedTime: " + attr.lastModifiedTime());

Answer 2

I've solved this problem using JDK 7 with this code:

package FileCreationDate;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Date;
import java.util.concurrent.TimeUnit;

public class Main
{
    public static void main(String[] args) {

        File file = new File("c:\\1.txt");
        Path filePath = file.toPath();

        BasicFileAttributes attributes = null;
        try
        {
            attributes =
                    Files.readAttributes(filePath, BasicFileAttributes.class);
        }
        catch (IOException exception)
        {
            System.out.println("Exception handled when trying to get file " +
                    "attributes: " + exception.getMessage());
        }
        long milliseconds = attributes.creationTime().to(TimeUnit.MILLISECONDS);
        if((milliseconds > Long.MIN_VALUE) && (milliseconds < Long.MAX_VALUE))
        {
            Date creationDate =
                    new Date(attributes.creationTime().to(TimeUnit.MILLISECONDS));

            System.out.println("File " + filePath.toString() + " created " +
                    creationDate.getDate() + "/" +
                    (creationDate.getMonth() + 1) + "/" +
                    (creationDate.getYear() + 1900));
        }
    }
}

Answer 3

As a follow-up to this question - since it relates specifically to creation time and discusses obtaining it via the new nio classes - it seems right now in JDK7's implementation you're out of luck. Addendum: same behaviour is in OpenJDK7.

On Unix filesystems you cannot retrieve the creation timestamp, you simply get a copy of the last modification time. So sad, but unfortunately true. I'm not sure why that is but the code specifically does that as the following will demonstrate.

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.*;

public class TestFA {
  static void getAttributes(String pathStr) throws IOException {
    Path p = Paths.get(pathStr);
    BasicFileAttributes view
       = Files.getFileAttributeView(p, BasicFileAttributeView.class)
              .readAttributes();
    System.out.println(view.creationTime()+" is the same as "+view.lastModifiedTime());
  }
  public static void main(String[] args) throws IOException {
    for (String s : args) {
        getAttributes(s);
    }
  }
}

Answer 4

The API of java.io.File only supports getting the last modified time. And the Internet is very quiet on this topic as well.

Unless I missed something significant, the Java library as is (up to but not yet including Java 7) does not include this capability. So if you were desperate for this, one solution would be to write some C(++) code to call system routines and call it using JNI. Most of this work seems to be already done for you in a library called JNA, though.

You may still need to do a little OS specific coding in Java for this, though, as you'll probably not find the same system calls available in Windows and Unix/Linux/BSD/OS X.

Answer 5

This is a basic example of how to get the creation date of a file in Java, using BasicFileAttributes class:

   Path path = Paths.get("C:\\Users\\jorgesys\\workspaceJava\\myfile.txt");
    BasicFileAttributes attr;
    try {
    attr = Files.readAttributes(path, BasicFileAttributes.class);
    System.out.println("Creation date: " + attr.creationTime());
    //System.out.println("Last access date: " + attr.lastAccessTime());
    //System.out.println("Last modified date: " + attr.lastModifiedTime());
    } catch (IOException e) {
    System.out.println("oops error! " + e.getMessage());
}

Answer 6

On a Windows system, you can use free FileTimes library.

This will be easier in the future with Java NIO.2 (JDK 7) and the java.nio.file.attribute package.

But remember that most Linux filesystems don't support file creation timestamps.

Answer 7

in java1.7+ You can use this code to get file`s create time !

private static LocalDateTime getCreateTime(File file) throws IOException {
        Path path = Paths.get(file.getPath());
        BasicFileAttributeView basicfile = Files.getFileAttributeView(path, BasicFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
        BasicFileAttributes attr = basicfile.readAttributes();
        long date = attr.creationTime().toMillis();
        Instant instant = Instant.ofEpochMilli(date);
        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    }

Answer 8

Basically after you get the creation date from the BasicFileAttributeView object, you should format the date to show:

String modifiedDate;
Path inPath = Paths.get(yourfile.getAbsolutePath());
BasicFileAttributes attr;
try {
    attr = Files.readAttributes(inPath, BasicFileAttributes.class);
} catch (IOException e) {
    attr = null;
}
        
if (attr == null) {
     this.modifiedDate = null;
} else {
    this.modifiedDate = simpleDateFormat.format(attr.creationTime().toMillis());
}