/**
  * Return the formated date of given registration variation by id.
  *
  * @param int $variation_id The variation ID to display schedule
  */
 public function registration_date($variation_id, $date_format = null)
 {
     $date = get_post_meta($variation_id, 'attribute_dates', true);
     if (!empty($date)) {
         $formated_date = WC_Registrations_Admin::registration_variation_option_name($date, $date_format);
         echo $formated_date;
     }
 }
        return $woocommerce_plugin_file;
    }
    /**
     * Display a welcome message. Called when the Registrations extension is activated.
     *
     * @since 1.0
     */
    public static function admin_installed_notice()
    {
        ?>
		<div id="message" class="updated woocommerce-message wc-connect registrations-for-woocommerce-activated">
			<div class="squeezer">
				<h4><?php 
        printf(__('%sRegistrations for WooCommerce Installed%s &#8211; %sYou\'re ready to start selling registrations!%s', 'registrations-for-woocommerce'), '<strong>', '</strong>', '<em>', '</em>');
        ?>
</h4>

				<p class="submit">
					<a href="https://twitter.com/share" class="twitter-share-button" data-url="https://wordpress.org/plugins/registrations-for-woocommerce/" data-text="<?php 
        _e('Sell course and events registrations with #WooCommerce', 'registrations-for-woocommerce');
        ?>
" data-via="HasteDesign" data-size="large">Tweet</a>
					<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>
				</p>
			</div>
		</div>
		<?php 
    }
}
WC_Registrations_Admin::init();