events metabox

class event_Meta_Box {

	public function __construct() {

		if ( is_admin() ) {
			add_action( 'load-post.php',     array( $this, 'init_metabox' ) );
			add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );
		}

	}

	public function init_metabox() {

		add_action( 'add_meta_boxes', array( $this, 'add_metabox'  )        );
		add_action( 'save_post',      array( $this, 'save_metabox' ), 10, 2 );

	}

	public function add_metabox() {

		add_meta_box(
			'date',
			__( 'Date', 'text_domain' ),
			array( $this, 'render_metabox' ),
			'post',
			'normal',
			'default'
		);

	}

	public function render_metabox( $post ) {

		// Retrieve an existing value from the database.
		$event_date = get_post_meta( $post->ID, 'event_date', true );
		$event_time = get_post_meta( $post->ID, 'event_time', true );

		// Set default values.
		if( empty( $event_date ) ) $event_date = '';
		if( empty( $event_time ) ) $event_time = '';

		// Form fields.
		echo '<table class="form-table">';

		echo '	<tr>';
		echo '		<th><label for="event_date" class="event_date_label">' . __( 'Date', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="date" id="event_date" name="event_date" class="event_date_field" placeholder="' . esc_attr__( 'date', 'text_domain' ) . '" value="' . esc_attr__( $event_date ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '	<tr>';
		echo '		<th><label for="event_time" class="event_time_label">' . __( 'time', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="time" id="event_time" name="event_time" class="event_time_field" placeholder="' . esc_attr__( 'ex.09:30', 'text_domain' ) . '" value="' . esc_attr__( $event_time ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '</table>';

	}

	public function save_metabox( $post_id, $post ) {

		// Sanitize user input.
		$event_new_date = isset( $_POST[ 'event_date' ] ) ? sanitize_text_field( $_POST[ 'event_date' ] ) : '';
		$event_new_time = isset( $_POST[ 'event_time' ] ) ? sanitize_text_field( $_POST[ 'event_time' ] ) : '';

		// Update the meta field in the database.
		update_post_meta( $post_id, 'event_date', $event_new_date );
		update_post_meta( $post_id, 'event_time', $event_new_time );

	}

}

new event_Meta_Box;