diff --git a/app/Auth/Clock.php b/app/Auth/Clock.php
new file mode 100644
index 0000000..b96ad32
--- /dev/null
+++ b/app/Auth/Clock.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Auth;
+
+use DateTimeImmutable;
+
+interface Clock
+{
+    public function now(): DateTimeImmutable;
+}