[2.3-develop] Forwardport of #11351

Author: magento-engcom-team

Diff for: app/code/Magento/Customer/Block/Widget/Dob.php

@@ -228,7 +228,7 @@ public function getHtmlExtraParams()
      */
     public function getDateFormat()
     {
-        return $this->_localeDate->getDateFormat(\IntlDateFormatter::SHORT);
+        return $this->_localeDate->getDateFormatWithLongYear();
     }
 
     /**

Diff for: app/code/Magento/Customer/Test/Unit/Block/Widget/DobTest.php

@@ -31,7 +31,7 @@ class DobTest extends \PHPUnit\Framework\TestCase
     const YEAR = '2014';
 
     // Value of date('Y', strtotime(self::DATE))
-    const DATE_FORMAT = 'M/d/yy';
+    const DATE_FORMAT = 'M/d/Y';
 
     /** Constants used by Dob::setDateInput($code, $html) */
     const DAY_HTML =