protected function get_popover_title() {
        $title = null;

        $userdate = userdate($this->data[0], get_string('strftimedayshort'));
        if (count($this->related['events'])) {
            $title = get_string('eventsfor', 'calendar', $userdate);
        } else if ($this->data['istoday']) {
            $title = $userdate;
        }

        if ($this->data['istoday']) {
            $title = get_string('todayplustitle', 'calendar', $userdate);
        }

        return $title;
    }