Set timestamp at the time of the copy

I use the date field as id for an event calendar. If the user duplicates a page using the “id” of the source, how can I automatically set the timestamp at the time of the copy?

    label: created
    type: date
    time: true
    width: 1/2
    default: now
    disabled: true

You probably need a plugin similar to the Custom Add Fields plugin but for the duplicate dialog. Other than that, you probably have to set the slug in a hook.

what about is there a tutorial on how to use these ?

Yes, that’s the one. And no, there is no tutorial, but there is not much to do. What you have to do inside the hook is call $duplicatePage->changeSlug().

can I change the contents of /content/events/xy/.xy.txt with the hook?

Yes, of course, but you were talking about the ID.

yes, but I use the timestamp as id, I won’t change the slug

Well, the slug is part of the page ID, but I guess we are talking at cross purposes.

I only need a unique number, so I’m using the date field. Presumably, there is also a better solution.

At the end I create from the page content a json file to make it available to another website to record the event in his program.


header('Content-type: application/json; charset=utf-8');
$data = $pages->find('veranstaltungen')->children()->published()->filterBy('category', '!=', '')->flip();

foreach($data as $article):
    $image = $article->event_image()->toFile();   
    $thumbURL = $image? $image->resize(1000)->url(): '';
    $event_date_start = date("Y-m-d H:i",strtotime($article->date_event_start()));
    $event_date_end = date("Y-m-d H:i",strtotime($article->date_event_end()));
    $event_id = strtotime($article->created());


    $json[] = 


    'event_id' => (string)$event_id,
    'event_title' => (string)$article->article_title(),
    'event_description' => (string)$article->text_full(),
    'image_url' => (string)$thumbURL,
    'detail_url'   => (string)$article->url(),
    'event_categories'   => [(string)$article->category()],
    'event_dates'   => [["start_date" => (string)$event_date_start,"end_date" => (string)$event_date_end]],
    'venue_name'=> "",
    'venue_address'=> "",
    'venue_city'   => 'Biel/Bienne',
    'venue_zip'   => '2502'


$json_parser = json_encode($json);
echo '{"api_key": "DFCS-AzU4k8kmJc", "events": '.$json_parser.'}';


I tried this:

 'hooks' => [
     'page.duplicate:after' => function ($duplicatePage) {
            if($duplicatePage->template() == "news")
              try {

                    $newcontent = $duplicatePage->update([
                    'title' => 'A new title'

                    echo 'The page has been updated:';

                  } catch(Exception $e) 

                    echo $e->getMessage();


error message: The JSON response from the API could not be parsed. Please check your API connection.

What this mean ?

but the page is duplicated (after a reload)

The problem is your echo statement, you cannot return or echo anything from a hook, only throw an exception.

Okay thank you @texnixe I mixed with the hook.

Now it works:

 'hooks' => [
     'page.duplicate:after' => function ($duplicatePage) {
            if($duplicatePage->template() == "news")
              try {

                    $dateNow = date_create()->format('Y-m-d H:i');
                    $newcontent = $duplicatePage->update([
                    'article_title' => 'new title',
                    'created' => $dateNow


                  } catch(Exception $e)