diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 36b5cb76..7c3451f1 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -1090,17 +1090,16 @@ class X509
         $notAfter = $this->currentCert['tbsCertificate']['validity']['notAfter'];
         $notAfter = isset($notAfter['generalTime']) ? $notAfter['generalTime'] : $notAfter['utcTime'];
 
-        switch (true) {
-            case is_string($date):
-                $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
-            default:
-                $notBefore = new DateTime($notBefore, new DateTimeZone(@date_default_timezone_get()));
-                $notAfter = new DateTime($notAfter, new DateTimeZone(@date_default_timezone_get()));
+        if (is_string($date)) {
+            $date = new DateTime($date, new DateTimeZone(@date_default_timezone_get()));
         }
 
+        $notBefore = new DateTime($notBefore, new DateTimeZone(@date_default_timezone_get()));
+        $notAfter = new DateTime($notAfter, new DateTimeZone(@date_default_timezone_get()));
+
         switch (true) {
-            case $date < new DateTime($notBefore, new DateTimeZone(@date_default_timezone_get())):
-            case $date > new DateTime($notAfter, new DateTimeZone(@date_default_timezone_get())):
+            case $date < $notBefore:
+            case $date > $notAfter:
                 return false;
         }
 
diff --git a/tests/Unit/File/X509/X509Test.php b/tests/Unit/File/X509/X509Test.php
index 41ddc1f8..2e513812 100644
--- a/tests/Unit/File/X509/X509Test.php
+++ b/tests/Unit/File/X509/X509Test.php
@@ -701,4 +701,31 @@ M0qaEPsM2o3CSTfxSJQQIyEe+izV3UQqYSyWkNqCCFPN
         X509::setRecurLimit(5);
         $this->assertTrue($x509->validateSignature());
     }
+
+    public function testValidateDate()
+    {
+        $x509 = new X509();
+        $x509->loadX509('-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----');
+
+        $this->assertFalse($x509->validateDate('Nov 22, 2018'));
+        $this->assertTrue($x509->validateDate('Nov 22, 2012'));
+    }
 }