NewFolderWithDateInFinder.jstalk

var windows  = [[SBApplication application:"Finder"] windows];

if ([windows count] > 0) {
    
    // from SBObject:
    // get() "Forces evaluation of the receiver, causing the real object to be returned immediately."
    var win = windows[0].get();
    var target = win.target().get();
    var url = [NSURL URLWithString:[target URL]];
    var path = [url path].replace("%20", " ");
    
    var date = new Date();
    
    var folderName = date.getFullYear() + "." + date.getMonth() + "." + date.getDate();
    
    print(folderName);
    
    var finalPath = path + '/' + folderName;
    
    [[NSFileManager defaultManager] createDirectoryAtPath: finalPath attributes:nil];
}
else {
    print("There's no window open")
}