diff --git a/src/View/Helper/DateFormat.php b/src/View/Helper/DateFormat.php
index 23c76884..9c09708f 100644
--- a/src/View/Helper/DateFormat.php
+++ b/src/View/Helper/DateFormat.php
@@ -76,7 +76,7 @@ public function __invoke(
         }
 
         $timezone    = $this->getTimezone();
-        $formatterId = md5($dateType . "\0" . $timeType . "\0" . $locale ."\0" . $pattern);
+        $formatterId = md5($dateType . "\0" . $timeType . "\0" . $locale . "\0" . $pattern . "\0" . $timezone);
 
         if (! isset($this->formatters[$formatterId])) {
             $this->formatters[$formatterId] = new IntlDateFormatter(
diff --git a/test/View/Helper/DateFormatTest.php b/test/View/Helper/DateFormatTest.php
index adeca753..d3b342a6 100644
--- a/test/View/Helper/DateFormatTest.php
+++ b/test/View/Helper/DateFormatTest.php
@@ -286,4 +286,19 @@ public function getIntlDateFormatter($locale, $dateType, $timeType, $timezone, $
     {
         return new IntlDateFormatter($locale, $dateType, $timeType, $timezone, null, $pattern);
     }
+
+    public function testDifferentTimezone()
+    {
+        $helper = $this->helper;
+
+        date_default_timezone_set('America/Chicago');
+        $date = new DateTime('2018-01-01');
+
+        self::assertSame('Jan 1, 2018', $helper($date, IntlDateFormatter::MEDIUM));
+
+        date_default_timezone_set('America/New_York');
+        $date = new DateTime('2018-01-01');
+
+        self::assertSame('Jan 1, 2018', $helper($date, IntlDateFormatter::MEDIUM));
+    }
 }