make Enquiry form date field to accept future dates only

gistfile1.txt

add_filter('pisol_eqw_date_field_html', function ($html) {

	$tomorrow = wp_date('Y-m-d', strtotime('+1 day'));

	libxml_use_internal_errors(true);

	$dom = new DOMDocument();

	$dom->loadHTML(
		mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'),
		LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD
	);

	libxml_clear_errors();

	$inputs = $dom->getElementsByTagName('input');

	foreach ($inputs as $input) {

		if ($input->getAttribute('type') === 'date') {
			$input->setAttribute('min', $tomorrow);
		}
	}

	return $dom->saveHTML();
});