diff --git a/src/features/schedule/components/ScheduleDetailsPage.tsx b/src/features/schedule/components/ScheduleDetailsPage.tsx
index 90126dbb..bb498d1c 100644
--- a/src/features/schedule/components/ScheduleDetailsPage.tsx
+++ b/src/features/schedule/components/ScheduleDetailsPage.tsx
@@ -31,11 +31,12 @@ export interface ScheduleDetailsPageProps {
 }
 
 /**
- * Convert yyyyMMdd to yyyy-MM-dd for the API.
+ * Convert yyyyMMdd to yyyy-MM-ddT00:00:00 for the API (matches Angular's
+ * ApiFormatterService.formatDate).
  */
 function formatApiDate(yyyymmdd: string): string {
   if (yyyymmdd.length !== 8) return yyyymmdd;
-  return `${yyyymmdd.slice(0, 4)}-${yyyymmdd.slice(4, 6)}-${yyyymmdd.slice(6, 8)}`;
+  return `${yyyymmdd.slice(0, 4)}-${yyyymmdd.slice(4, 6)}-${yyyymmdd.slice(6, 8)}T00:00:00`;
 }
 
 /**