eventespresso / event-espresso-core

     *                         timezone in the 'timezone_string' wp option)

     * @return static (as in the concrete child class)

     */

    public static function instance($timezone = null)

    {

        // check if instance of Espresso_model already exists

        if ( ! static::$_instance instanceof static) {

            // instantiate Espresso_model

            static::$_instance = new static($timezone);

        }

        //we might have a timezone set, let set_timezone decide what to do with it

        static::$_instance->set_timezone($timezone);

        // Espresso_model object

        return static::$_instance;

    }

    /**

     * resets the model and returns it

     *

     * @return EEM_Event

     */

    public static function instance($timezone = null)

    {

        // check if instance of EEM_Event already exists

        if ( ! self::$_instance instanceof EEM_Event) {

            // instantiate Espresso_model

            self::$_instance = new self($timezone);

        }

        //we might have a timezone set, let set_timezone decide what to do with it

        self::$_instance->set_timezone($timezone);

        // EEM_Event object

        return self::$_instance;

    }