magento 2.3 overide date calendar class

I am trying to overide a date calendar class in magento.
But when i try doing it the date input from product page disappears.
Basic i want to overide the date calendar script to add custom settings to it.
I added a hidden span to see if my changes gets out.

c3mcustommoduleModelDate

< ?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace c3mcustommoduleModel;
//namespace MagentoFrameworkViewElementHtml;

/**
 * Date element block
 */
class Date extends MagentoFrameworkViewElementTemplate
{
    /**
     * Render block HTML
     *
     * @return string
     * @SuppressWarnings(PHPMD.NPathComplexity)
     */
    protected function _toHtml()
    {
        $html = 'escapeHtml($this->getValue()) . '" ';
        $html .= 'class="' . $this->getClass() . '" ' . $this->getExtraParams() . '/> ';
        $calendarYearsRange = $this->getYearsRange();
        $changeMonth = $this->getChangeMonth();
        $changeYear = $this->getChangeYear();
        $maxDate = $this->getMaxDate();
        $showOn = $this->getShowOn();
        $firstDay = $this->getFirstDay();

        $html .= '123';

        return $html;
    }

    /**
     * Convert special characters to HTML entities
     *
     * @return string
     */
    public function getEscapedValue()
    {
        if ($this->getFormat() && $this->getValue()) {
            return strftime($this->getFormat(), strtotime($this->getValue()));
        }
        return $this->escapeHtml($this->getValue());
    }

    /**
     * Produce and return block's html output
     *
     * {@inheritdoc}
     *
     * @return string
     */
    public function getHtml()
    {
        return $this->toHtml();
    }
}
?>

c3mcustommoduleetcdi

< ?xml version="1.0"?>

    

You can see at the picture i added that the calendar input is gone.