diff --git a/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php b/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php
index 68a97c9fde482..c7512c4041b5f 100644
--- a/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php
+++ b/lib/internal/Magento/Framework/Stdlib/DateTime/Timezone.php
@@ -245,8 +245,8 @@ 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 $pattern
      * @return string
      */
diff --git a/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php b/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php
index 539715003e16d..381e7faf8c084 100644
--- a/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php
+++ b/lib/internal/Magento/Framework/Stdlib/DateTime/TimezoneInterface.php
@@ -125,8 +125,8 @@ public function isScopeDateInInterval($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
      */