How do I touch a folder with current time using set last modified date & time?

Question

I'm trying to update the last modified date of a specific folder, here's what I've got:

public void touchFolder(){
    File folderToTest = new File("C:\\Temp");
    SimpleDateFormat dateFormatUtc = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    dateFormatUtc.setTimeZone(TimeZone.getTimeZone("UTC"));
    String newTime = dateFormatUtc.format(new Date());
    folderToTest.setLastModified(Long.parseLong(newTime));
}

I am just putting this code in a test case so don't worry about calling this method etc.

I'm getting errors with the parsing that date format as a long, what's the format used in setting the last modified date & time?

Answer 1

This is an example from the documentation, using java.nio.file.Files:

Path path = ...
FileTime now = FileTime.fromMillis(System.currentTimeMillis());
Files.setLastModifiedTime(path, now);

Answer 2

I think you should just do folderToTest.setLastModified(System.currentTimeMillis());