diff --git a/adminer/create.inc.php b/adminer/create.inc.php
index 7a469bfc..62fffc45 100644
--- a/adminer/create.inc.php
+++ b/adminer/create.inc.php
@@ -64,7 +64,7 @@ if ($_POST && !$error && !$_POST["add"] && !$_POST["drop_col"] && !$_POST["up"]
 			query_redirect("ALTER TABLE " . idf_escape($_GET["create"]) . implode(",", $fields) . ",\nRENAME TO " . idf_escape($_POST["name"]) . ",\n$status", $location, lang('Table has been altered.'));
 		} else {
 			$path = preg_replace('~\\?.*~', '', $_SERVER["REQUEST_URI"]);
-			setcookie("adminer_engine", $_POST["Engine"], strtotime("+1 month"), $path);
+			setcookie("adminer_engine", $_POST["Engine"], gmmktime(0, 0, 0, gmdate("n") + 1), $path);
 			query_redirect("CREATE TABLE " . idf_escape($_POST["name"]) . " (" . implode(",", $fields) . "\n) $status", $location, lang('Table has been created.'));
 		}
 	}
diff --git a/adminer/include/lang.inc.php b/adminer/include/lang.inc.php
index fb650c07..51ff8cb1 100644
--- a/adminer/include/lang.inc.php
+++ b/adminer/include/lang.inc.php
@@ -45,7 +45,7 @@ if (isset($_GET["lang"])) {
 
 $LANG = "en";
 if (isset($langs[$_COOKIE["adminer_lang"]])) {
-	setcookie("adminer_lang", $_COOKIE["adminer_lang"], strtotime("+1 month"), preg_replace('~\\?.*~', '', $_SERVER["REQUEST_URI"]));
+	setcookie("adminer_lang", $_COOKIE["adminer_lang"], gmmktime(0, 0, 0, gmdate("n") + 1), preg_replace('~\\?.*~', '', $_SERVER["REQUEST_URI"]));
 	$LANG = $_COOKIE["adminer_lang"];
 } elseif (isset($langs[$_SESSION["lang"]])) {
 	$LANG = $_SESSION["lang"];