diff --git a/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php b/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php
index acb2c5b4f1d15..13b7494f9c75e 100644
--- a/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php
+++ b/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php
@@ -286,8 +286,8 @@ public function isScopeDateInInterval($scope, $dateFrom = null, $dateTo = null)
      * @param string|\DateTimeInterface $date
      * @param int $dateType
      * @param int $timeType
-     * @param null $locale
-     * @param null $timezone
+     * @param string|null $locale
+     * @param string|null $timezone
      * @param string|null $pattern
      * @return string
      */
diff --git a/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php b/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php
index 047ca9d8b4528..a8b3fb1a81ffe 100644
--- a/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php
+++ b/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php
@@ -124,8 +124,8 @@ public function isScopeDateInInterval($scope, $dateFrom = null, $dateTo = null);
      * @param string|\DateTimeInterface $date
      * @param int $dateType
      * @param int $timeType
-     * @param null $locale
-     * @param null $timezone
+     * @param string|null $locale
+     * @param string|null $timezone
      * @param string|null $pattern
      * @return string
      */