Add post meta data date to event

I created a post metabox that uses the datepicker to pick a date value. I got as far as adding the metabox and getting the datepicker to work but other than that im struggling to get the data saved to the post. This is my code in my functions.php:

//Add date picker css function admin_styles() {     if ( 'events' === get_current_screen()->id ) {         wp_enqueue_style( 'jquery-ui-smoothness', // wrapped for brevity             '//code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.css', [], null );     } } add_action('admin_print_styles', 'admin_styles'); //Activate function function admin_scripts() {     if ( 'events' === get_current_screen()->id ) {         wp_enqueue_script( 'admin', get_template_directory_uri() .'/js/admin.js', [ 'jquery-ui-datepicker' ] );     } } add_action( 'admin_enqueue_scripts', 'admin_scripts' );  //Add date meta-boxes  function post_date_field($  post) {    echo '<input type="text" id="jquery-datepicker" name="entry_post_date" value="' . get_post_meta( $  post->ID, 'entry_post_date', true ) . '">'; } function post_date_meta_box() {   add_meta_box('entry_post_date', 'Date', 'post_date_field', 'events', 'side', 'high'); } add_action('add_meta_boxes', 'post_date_meta_box');  //Save Data function save_date_meta_box($  post_id){     global $  post;     if( $  post->post_type == "events"){         if (isset($  _POST)){             update_post_meta( $  post_id, 'entry_post_date', strip_tags( $  _POST['entry_post_date'] ) );         }     } } 

After publishing or updating the post I dont think the date value is saved