Hi, I want to add a custom field(want to get date) to my custom post type and then get posts which are before the given date in the custom field

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WordPress

Hi all "Want to do it without plugin"

Firstly how can I create a custom field in my custom post type where I can get the date // Our custom post type function function create_posttype() {

register_post_type( '', // CPT Options array( 'labels' => array( 'name' => __( 'Archive' ), ), 'public' => true, 'has_archive' => true, 'rewrite' => array('slug' => 'Archive'), 'show_in_rest' => true,

 )
); } // Hooking up our function to theme setup add_action( 'init', 'create_posttype' );

I want to fetch the posts which has date in "Custom post" before the current date. Example -> If in the custom field I entered 2021-12-25 and it's before the current date then the post should be fetched and after the current date crossed 2021-12-25 post should not be fetched.

What I have tried:

tried using Suppots while registering the custom post type but it takes a simple value not the date and also tried using meta_query to fetch the results