iso8601_to_datetime example

        if ( ! empty( $post_data['post_date_gmt'] ) ) {
            // We know this is supposed to be GMT, so we're going to slap that Z on there by force.             $dateCreated = rtrim( $post_data['post_date_gmt']->getIso(), 'Z' ) . 'Z';
        } elseif ( ! empty( $post_data['post_date'] ) ) {
            $dateCreated = $post_data['post_date']->getIso();
        }

        // Default to not flagging the post date to be edited unless it's intentional.         $post_data['edit_date'] = false;

        if ( ! empty( $dateCreated ) ) {
            $post_data['post_date']     = iso8601_to_datetime( $dateCreated );
            $post_data['post_date_gmt'] = iso8601_to_datetime( $dateCreated, 'gmt' );

            // Flag the post date to be edited.             $post_data['edit_date'] = true;
        }

        if ( ! isset( $post_data['ID'] ) ) {
            $post_data['ID'] = get_default_post_to_edit( $post_data['post_type'], true )->ID;
        }
        $post_id = $post_data['ID'];