Update app.py

app.py

@@ -359,9 +359,11 @@ def search(search_in, max_results=3):
     )
 
 def set_date(title):
-    paper = title2qna[title]
-    year, month, day = paper["target_date"].strftime("%Y-%m-%d").split("-")
-    return year, month, day
+    for _, (year, months) in enumerate(date_dict.items()):
+        for _, (month, days) in enumerate(months.items()):
+            for _, (day, papers) in enumerate(days.items()):
+                if title in papers:
+                    return year, month, day
 
 def set_papers(y, m, d, title):
     papers = [paper["title"] for paper in date_dict[y][m][d]]