MAGETWO-94196: [2.1] The fix of incorrect date format was lost since 2.1.13

Author: Bohdan Korablov

dev/tests/integration/testsuite/Magento/Customer/Controller/Account/CreatePostTest.php

@@ -26,7 +26,7 @@ protected function setUp()
     }
 
     /**
-     * @magentoDbIsolation disabled
+     * @magentoDbIsolation enabled
      * @magentoDataFixture Magento/Customer/_files/date_attribute.php
      * @magentoDataFixture Magento/Customer/_files/customer_date_attribute.php
      */

lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php

@@ -192,7 +192,7 @@ public function date($date = null, $locale = null, $useTimezone = true, $include
      * @param bool $includeTime
      * @return string
      */
-    private function prepareDate(string $date, string $locale, string $timezone, bool $includeTime) : string
+    private function prepareDate(string $date, string $locale, string $timezone, bool $includeTime)
     {
         $timeType = $includeTime ? \IntlDateFormatter::SHORT : \IntlDateFormatter::NONE;
         $formatter = new \IntlDateFormatter(
@@ -360,11 +360,11 @@ public function convertConfigTimeToUtc($date, $format = 'Y-m-d H:i:s')
      * @param string $date
      * @return string
      */
-    private function appendTimeIfNeeded(string $date) : string
+    private function appendTimeIfNeeded(string $date)
     {
         if (!preg_match('/\d{1,2}:\d{2}/', $date)) {
             $date .= " 00:00";
         }
         return $date;
     }
-}
+}