diff --git a/content-security-policy/reporting/support/set-cookie.py b/content-security-policy/reporting/support/set-cookie.py
index 38325f0651be0c..db747bcd3bdaeb 100644
--- a/content-security-policy/reporting/support/set-cookie.py
+++ b/content-security-policy/reporting/support/set-cookie.py
@@ -1,3 +1,5 @@
+from datetime import date
+
 def main(request, response):
     """
     Returns cookie name and path from query params in a Set-Cookie header.
@@ -11,7 +13,7 @@ def main(request, response):
     >
     < HTTP/1.1 200 OK
     < Content-Type: application/json
-    < Set-Cookie: match-slash=1; Path=/; Expires=Wed, 09 Jun 2021 10:18:14 GMT
+    < Set-Cookie: match-slash=1; Path=/; Expires=09 Jun 2021 10:18:14 GMT
     < Server: BaseHTTP/0.3 Python/2.7.12
     < Date: Tue, 04 Oct 2016 18:16:06 GMT
     < Content-Length: 80
@@ -19,7 +21,8 @@ def main(request, response):
 
     name = request.GET[b'name']
     path = request.GET[b'path']
-    cookie = b"%s=1; Path=%s; Expires=Wed, 09 Jun 2021 10:18:14 GMT" % (name, path)
+    expiry_year = date.today().year + 1
+    cookie = b"%s=1; Path=%s; Expires=09 Jun %d 10:18:14 GMT" % (name, path, expiry_year)
 
     headers = [
         (b"Content-Type", b"application/json"),
diff --git a/cookies/resources/set-cookie.py b/cookies/resources/set-cookie.py
index 38325f0651be0c..db747bcd3bdaeb 100644
--- a/cookies/resources/set-cookie.py
+++ b/cookies/resources/set-cookie.py
@@ -1,3 +1,5 @@
+from datetime import date
+
 def main(request, response):
     """
     Returns cookie name and path from query params in a Set-Cookie header.
@@ -11,7 +13,7 @@ def main(request, response):
     >
     < HTTP/1.1 200 OK
     < Content-Type: application/json
-    < Set-Cookie: match-slash=1; Path=/; Expires=Wed, 09 Jun 2021 10:18:14 GMT
+    < Set-Cookie: match-slash=1; Path=/; Expires=09 Jun 2021 10:18:14 GMT
     < Server: BaseHTTP/0.3 Python/2.7.12
     < Date: Tue, 04 Oct 2016 18:16:06 GMT
     < Content-Length: 80
@@ -19,7 +21,8 @@ def main(request, response):
 
     name = request.GET[b'name']
     path = request.GET[b'path']
-    cookie = b"%s=1; Path=%s; Expires=Wed, 09 Jun 2021 10:18:14 GMT" % (name, path)
+    expiry_year = date.today().year + 1
+    cookie = b"%s=1; Path=%s; Expires=09 Jun %d 10:18:14 GMT" % (name, path, expiry_year)
 
     headers = [
         (b"Content-Type", b"application/json"),