MAGETWO-68976: [Magento Cloud] Incorrect date format with Arabic language locale

 - filter out any additional locale information besides MmDdYy and the separators (‘/‘,’.’,’-‘)

Author: Robert He

app/code/Magento/Catalog/Block/Product/View/Options/Type/Date.php

@@ -83,7 +83,10 @@ public function getCalendarDateHtml()
 
         $dateFormat = $this->_localeDate->getDateFormat(\IntlDateFormatter::SHORT);
         /** Escape RTL characters which are present in some locales and corrupt formatting */
-        $escapedDateFormat = preg_replace('/[^[:print:]]/', '', $dateFormat);
+        $patterns = [];
+        $patterns[0] = '/[^[:print:]]/';
+        $patterns[1] = '/[^MmDdYy\/\.\-]/';
+        $escapedDateFormat = preg_replace($patterns, '', $dateFormat);
         $calendar = $this->getLayout()->createBlock(
             \Magento\Framework\View\Element\Html\Date::class
         )->setId(