diff --git a/src/admin/routes/submissions/[form]/index.tsx b/src/admin/routes/submissions/[form]/index.tsx
index c442791..b04aef6 100644
--- a/src/admin/routes/submissions/[form]/index.tsx
+++ b/src/admin/routes/submissions/[form]/index.tsx
@@ -31,10 +31,10 @@ export default function SubmissionsFormRoute(
           <table class="admin-table">
             <thead><tr><th>ID</th><th>Submitted</th><th>Status</th><th></th></tr></thead>
             <tbody>
-              {(data.items as Array<{ id: string; createdAt: number; status: string }>).map((s) => (
+              {(data.items as Array<{ id: string; receivedAt: number; status: string }>).map((s) => (
                 <tr key={s.id}>
                   <td><code class="s-6b9c179a">{s.id}</code></td>
-                  <td class="s-3044b600">{new Date(s.createdAt).toLocaleString()}</td>
+                  <td class="s-3044b600">{new Date(s.receivedAt).toLocaleString()}</td>
                   <td><span class="badge">{s.status}</span></td>
                   <td><a href={`${data.prefix}/submissions/${data.form}/${s.id}`} class="btn btn-sm">View</a></td>
                 </tr>
diff --git a/tests/admin/submissions_list_test.tsx b/tests/admin/submissions_list_test.tsx
new file mode 100644
index 0000000..743bdae
--- /dev/null
+++ b/tests/admin/submissions_list_test.tsx
@@ -0,0 +1,27 @@
+/** @jsxImportSource preact */
+/**
+ * Regression test: the per-form submissions list must render the submission
+ * timestamp from `receivedAt` (Unix ms, the field on the Submission
+ * interface). It previously read `s.createdAt`, which does not exist, so
+ * every row showed "Invalid Date".
+ */
+
+import { assertEquals, assertStringIncludes } from "https://deno.land/std@0.224.0/assert/mod.ts";
+import { render } from "preact-render-to-string";
+import SubmissionsFormRoute from "../../src/admin/routes/submissions/[form]/index.tsx";
+
+Deno.test("submissions list: renders a valid date from receivedAt (not 'Invalid Date')", () => {
+  const receivedAt = 1788249949694;
+  const html = render(
+    <SubmissionsFormRoute
+      data={{
+        form: "join",
+        prefix: "/admin",
+        items: [{ id: "abc123", receivedAt, status: "new" }],
+      }}
+    />,
+  );
+
+  assertEquals(html.includes("Invalid Date"), false);
+  assertStringIncludes(html, new Date(receivedAt).toLocaleString());
+});