diff --git a/apps/server/src/sync/schedule-sync.service.spec.ts b/apps/server/src/sync/schedule-sync.service.spec.ts
index aa87705..4036bb2 100644
--- a/apps/server/src/sync/schedule-sync.service.spec.ts
+++ b/apps/server/src/sync/schedule-sync.service.spec.ts
@@ -371,14 +371,9 @@ describe('ScheduleSyncService — dedup', () => {
       seen.add(k);
     }
 
-    // At least one item exists for 07-08 (proving overlap was handled)
-    // work_date is epoch ms at 00:00:00+08:00; convert back to date string
-    const fmtDate = (epochMs: number) => {
-      const d = new Date(epochMs);
-      return new Date(d.getTime() - d.getTimezoneOffset() * 60000)
-        .toISOString().slice(0, 10);
-    };
-    const july8Items = batchItems.filter((i) => fmtDate(i.work_date) === '2026-07-08');
+    // Compare the exact Beijing-midnight epoch so this assertion is independent of host timezone.
+    const july8Epoch = new Date('2026-07-08T00:00:00+08:00').getTime();
+    const july8Items = batchItems.filter((item) => item.work_date === july8Epoch);
     expect(july8Items.length).toBe(1);
   });
 });