fix: make Time immutable

system/I18n/TimeLegacy.php

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\I18n;
+
+use DateTime;
+
+/**
+ * Legacy Time class.
+ *
+ * This class is only for backward compatibility. Do not use.
+ * This is not immutable! Some methods are immutable,
+ * but some methods can alter the state.
+ *
+ * @property string $date
+ *
+ * @deprecated Use Time instead.
+ */
+class TimeLegacy extends DateTime
+{
+    use TimeTrait;
+}