diff --git a/test/invoice-dedup.test.ts b/test/invoice-dedup.test.ts
index d86f15c..0a61026 100644
--- a/test/invoice-dedup.test.ts
+++ b/test/invoice-dedup.test.ts
@@ -14,6 +14,8 @@ import type { XftApprovalProvider } from "../src/xft.js";
 import { UnifiedApprovalService } from "../src/unified-approval.js";
 
 const secret = "invoice-dedup-test-secret-with-at-least-32-bytes";
+// Retained fixtures must stay inside the production retention window as calendar time advances.
+const recentSubmittedAt = new Date(Date.now() - 86_400_000).toISOString();
 
 function config(): AppConfig {
   return {
@@ -51,7 +53,7 @@ test("invoice store persists only HMAC fingerprints and isolates users across re
   const evidence = extractInvoiceEvidence({ invoiceCode: "044031900111", invoiceNumber: "87654321" });
   const first = new InvoiceDedupStore(path, secret);
   const userOne = first.userHash("private-user-one");
-  first.indexDetail(userOne, "xft", "business-1", "pending", "2026-08-01T01:00:00.000Z", evidence);
+  first.indexDetail(userOne, "xft", "business-1", "pending", recentSubmittedAt, evidence);
   assert.ok(first.findMatches(userOne, evidence).length >= 1);
   assert.equal(first.findMatches(first.userHash("private-user-two"), evidence).length, 0);
 
@@ -91,7 +93,7 @@ test("dedup preparation blocks historical duplicates and concurrent confirmation
       observedRange = range;
       return { items: [{
         source: "official_oa", historyScope: "submitted", processInstanceId: "oa-existing",
-        status: "COMPLETED", result: "agree", submittedAt: "2026-08-01T01:00:00.000Z",
+        status: "COMPLETED", result: "agree", submittedAt: recentSubmittedAt,
       }], diagnostics: {} };
     },
     async getHistoryDetail() {
@@ -161,7 +163,7 @@ test("rejected prior bills warn instead of masquerading as active approvals", as
   const root = mkdtempSync(join(tmpdir(), "ding-invoice-rejected-"));
   const store = new InvoiceDedupStore(join(root, "dedup.sqlite"), secret);
   const evidence = extractInvoiceEvidence({ invoiceCode: "044031900111", invoiceNumber: "87654321" });
-  store.indexDetail(store.userHash("user-1"), "xft", "xft-rejected", "rejected", "2026-08-01T00:00:00.000Z", evidence);
+  store.indexDetail(store.userHash("user-1"), "xft", "xft-rejected", "rejected", recentSubmittedAt, evidence);
   const ding = { async listMyHistory() { return { items: [], diagnostics: {} }; } } as unknown as ApprovalService;
   const xft = { async listMyHistory() { return { items: [], totalCount: 0, diagnostics: {} }; } } as unknown as XftApprovalProvider;
   const service = new InvoiceDeduplicationService(config(), store, ding, xft);