diff --git a/api-v3/test/unit/field-briefing-runtime.test.ts b/api-v3/test/unit/field-briefing-runtime.test.ts
new file mode 100644
index 0000000..2665d1d
--- /dev/null
+++ b/api-v3/test/unit/field-briefing-runtime.test.ts
@@ -0,0 +1,50 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import type { DataSource } from 'typeorm';
+import { FieldBriefingService } from '../../src/act-administration/field-briefing.service';
+
+test('field briefing convierte el timestamptz de pg a YYYY-MM-DD antes del cast SQL', async () => {
+  const calls: Array<{ sql: string; params: unknown[] }> = [];
+  let queryNumber = 0;
+
+  const dataSource = {
+    query: async (sql: string, params: unknown[]) => {
+      calls.push({ sql, params });
+      queryNumber += 1;
+
+      if (queryNumber === 1) {
+        return [{
+          id: '11111111-1111-4111-8111-111111111111',
+          code: 'INSP-00002-17-09-26',
+          status: 'DRAFT',
+          plannedStartAt: new Date('2026-09-17T23:42:00.000Z'),
+          areaId: '22222222-2222-4222-8222-222222222222',
+          companyId: '33333333-3333-4333-8333-333333333333',
+          areaCode: 'PRES-AREA-TEST',
+          areaName: 'Barrancas',
+          companyCode: 'PRES-ORG-TEST',
+          companyName: 'Petróleos Sudamericanos Energy S.A.',
+        }];
+      }
+
+      return [];
+    },
+  } as unknown as DataSource;
+
+  const result = await new FieldBriefingService(dataSource).forVisit(
+    '11111111-1111-4111-8111-111111111111',
+  );
+
+  assert.equal(calls.length, 2);
+  assert.equal(calls[1]?.params[3], '2026-09-17');
+  assert.equal(result.plannedOn, '2026-09-17');
+  assert.deepEqual(result.summary, {
+    acts: 0,
+    findings: 0,
+    inventoryItems: 0,
+    responseOverdue: 0,
+    commitmentOverdue: 0,
+    verificationPending: 0,
+  });
+  assert.deepEqual(result.acts, []);
+});