diff --git a/bin/date/vary.h b/bin/date/vary.h
--- a/bin/date/vary.h
+++ b/bin/date/vary.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
  * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
  * All rights reserved.
  *
diff --git a/bin/date/vary.c b/bin/date/vary.c
--- a/bin/date/vary.c
+++ b/bin/date/vary.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
  * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
  * All rights reserved.
  *