diff --git a/recounting_dashboard.py b/recounting_dashboard.py
index 429a61a..0ce5458 100644
--- a/recounting_dashboard.py
+++ b/recounting_dashboard.py
@@ -69,6 +69,15 @@ def _api_get(base_url, path, default=None):
     return default
 
 
+def _folder_date(filepath):
+    output = Path(OUTPUT_DIR)
+    rel = Path(filepath).relative_to(output)
+    parts = rel.parts
+    if len(parts) >= 2:
+        return parts[0]
+    return None
+
+
 def _stop_ffmpeg_locked():
     global _streaming_proc, _streaming_mp4
     if _streaming_proc:
@@ -207,10 +216,12 @@ def api_download_mp4():
 def api_batch_result():
     fpath = request.args.get("file", "")
     filename = Path(fpath).name
-    batch_num, date_str = _parse_filename(filename)
+    batch_num, _ = _parse_filename(filename)
     if batch_num is None:
         return jsonify({"success": False, "error": "Cannot parse batch number from filename"}), 200
 
+    date_str = _folder_date(fpath) or _parse_filename(filename)[1]
+
     def _match_in_batches(batches):
         for b in batches:
             if b.get("batch_number") == batch_num: