AC-12025::DOB issue: leading zero is missing for single digit month

Author: glo71317

app/code/Magento/Customer/Block/Widget/Dob.php

@@ -303,6 +303,7 @@ public function getHtmlExtraParams()
     public function getDateFormat()
     {
         $dateFormat = $this->setTwoDayPlaces($this->_localeDate->getDateFormatWithLongYear());
+        $dateFormat = $this->setTwoMonthPlaces($dateFormat);
         /** Escape RTL characters which are present in some locales and corrupt formatting */
         $escapedDateFormat = preg_replace('/[^MmDdYy\/\.\-]/', '', $dateFormat);
 
@@ -440,4 +441,19 @@ private function setTwoDayPlaces(string $format): string
             $format
         );
     }
+
+    /**
+     * Set 2 places for month value in format string
+     *
+     * @param string $format
+     * @return string
+     */
+    private function setTwoMonthPlaces(string $format): string
+    {
+        return preg_replace(
+            '/(?<!M)M(?!M)/',
+            'MM',
+            $format
+        );
+    }
 }

app/code/Magento/Customer/view/frontend/web/js/validation.js

@@ -11,10 +11,8 @@ define([
     $.validator.addMethod(
         'validate-date',
         function (value, element, params) {
-            if (params.dateFormat === 'M/dd/y') {
-                params.dateFormat = 'MM/dd/y';
-            }
             var dateFormat = utils.normalizeDate(params.dateFormat);
+
             if (value === '') {
                 return true;
             }