Question

I’m looking for a way to get a directories modification date. I’ve tried:

File dir = new File(myDir);
long mod = dir.lastModified();

But it’s returning 0.

I’m also looking for a way to set the last modification date of a directory but haven’t found anything.

Is there a documented way to do these?

Answer 1

Edit:
Your code looks right, Just check the existence of directory..

public long lastModified ()

Returns the time when this file was last modified, measured in milliseconds since January 1st, 1970, midnight. Returns 0 if the file does not exist.

So just check whether your file is exist or not..

CODE:

For get Last modified date from file,

File file = new File("Your file path");
Date lastModDate = new Date(file.lastModified());
Log.i("File last modified : "+ lastModDate.toString());

To set Last Modified date to a file..

try{

    File file = new File("/mnt/sdcard/temp.txt");

    //print the original last modified date
    SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
    Log.i("Original Last Modified Date : " , ""+sdf.format(file.lastModified()));

    //set this date 
    String newLastModified = "01/06/2012";

    //need convert the above date to milliseconds in long value 
    Date newDate = sdf.parse(newLastModified);
    file.setLastModified(newDate.getTime());

    //print the latest last modified date
    Log.i("Lastest Last Modified Date : ", ""+sdf.format(file.lastModified()));

    }catch(ParseException e){
        e.printStackTrace();
    }