When I do something like this (in my plugin function inside WP admin):

$metaboxes = get_post_meta( $post_id );
echo "<pre>";
echo "</pre>";

I get all my metaboxes info except the datetime.

Why is that? Where are they stored and how can I access them?

I am using this plugin http://www.deluxeblogtips.com/meta-box/ to add custom meta fields to my content type like:

  'name'  => 'Date and time:',
  'type'  => 'datetime',
  'id'    => "rw_datetime",

I want to save the datetime field if some other field has certain value using save_post function and this is not working for datetime for some reason:

update_post_meta($post_id, 'rw_datetime', '2013-08-28 11:11' );

But something like this for a text field is working nice:

update_post_meta($post_id, 'rw_some_textfield', 'This is working!' );

Why is that? Why it's not working for datetime and why it is working for other field types?

How can I grab the datetime value if I know the $post_id and then update this field using update_post_meta() function?


Code of my save_post function:

add_action( 'save_post', 'things_before_save' ); 

function things_before_save( $post_id ) { 

    // No auto saves 
    if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return; 

    // make sure the current user can edit the post 
    if( ! current_user_can( 'edit_post' ) ) return;

    // assure the post type
    if ( ! get_post_type($post_id) == 'cards' ) return;

    // working
    update_post_meta($post_id, 'rw_some_textfield', 'This is working!' );

    // not working ;(
    update_post_meta($post_id, 'rw_datetime', '2013-08-28 11:11' );


Notice that I am not working with any variables, just with strings This is working! and 2013-08-28 11:11 to eliminate possible errors.

So, I guess the problem is that rw_datetime is stored somewhere else and not at the same place as other metaboxes.

  • Please can you post your code? Have you checked your post meta table?
    – iEmanuele
    Commented Aug 22, 2013 at 19:44
  • @iEmanuele I have updated my question with the code. Please, check it now, thank you.
    – Derfder
    Commented Aug 22, 2013 at 20:00

1 Answer 1


it seems that you're using that plugin in a wrong way. It's not necessary hook to save_post because the plugin do it for you. Simply register your meta box and your fields. To retrieve the values check this

  • things_before_save = I need to make some changes in the save process depending on other things. I have just simplified stuff to not make it more complicated. Please, chcek this post for more details on my situation: wordpress.stackexchange.com/questions/111173/… It describes the reason why I need to make another function using save_post. The question is mostly solved, but I am stuck on the saving of the datetime field. Other fields can be saved without a problem.
    – Derfder
    Commented Aug 22, 2013 at 20:43
  • @Derfder the question you linked, answered by me, do not takes into account the plugin you used. (In that question you don't say anything about any plugin) I don't know that plugin, my function is intended to work without plugins. Maybe problem is there.
    – gmazzap
    Commented Aug 22, 2013 at 20:51
  • @G.M. Ok, I will tick your answer as solved ;). It's probably caused by that plugin.
    – Derfder
    Commented Aug 22, 2013 at 21:09

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