Use current date (Y/m/d) as custom path

[holymp2006]

How can one use date('Y'), date('m'), and date('d') as custom path, when creating a file?

I need to change the media paths to something like /base/2022/08/24/md5(xxxxxxxx)/filename.pdf.
I have figured out how this might be done when retrieving the media, by extending and modifying the BasePathGenerator class as so:

...
class MediaPathGenerator extends BasePathGenerator
{
    protected function getBasePath(Media $media): string
    {
        return $media->created_at->format('Y/m/d') . '/' . $media->getKey();
    }
}
...

But how do I save a file to "/base/date('Y/m/d') . '/'..."?