Update app.py

app.py

@@ -13,6 +13,8 @@ from gradio_calendar import Calendar
 import datasets
 import requests
 
+from datetime import timezone  # Added import to fix the NameError
+
 # --- Data Loading and Processing ---
 
 api = HfApi()
@@ -186,12 +188,12 @@ class PaperManager:
         published_at_str = row.get('date', datetime.datetime.now(timezone.utc).isoformat())
         try:
             published_time = datetime.datetime.strptime(published_at_str, "%Y-%m-%d")
-            published_time = published_time.replace(tzinfo=datetime.timezone.utc)
+            published_time = published_time.replace(tzinfo=timezone.utc)
         except ValueError:
             # If parsing fails, use current time to minimize the impact on sorting
-            published_time = datetime.datetime.now(datetime.timezone.utc)
+            published_time = datetime.datetime.now(timezone.utc)
 
-        time_diff = datetime.datetime.now(datetime.timezone.utc) - published_time
+        time_diff = datetime.datetime.now(timezone.utc) - published_time
         time_diff_hours = time_diff.total_seconds() / 3600  # Convert time difference to hours
 
         # Avoid division by zero and apply the hotness formula
@@ -246,10 +248,10 @@ class PaperManager:
         comments = row.get('💬', 0)
         published_time_str = row.get('date', datetime.datetime.now(timezone.utc).strftime("%Y-%m-%d"))
         try:
-            published_time = datetime.datetime.strptime(published_time_str, "%Y-%m-%d").replace(tzinfo=datetime.timezone.utc)
+            published_time = datetime.datetime.strptime(published_time_str, "%Y-%m-%d").replace(tzinfo=timezone.utc)
         except ValueError:
-            published_time = datetime.datetime.now(datetime.timezone.utc)
-        time_diff = datetime.datetime.now(datetime.timezone.utc) - published_time
+            published_time = datetime.datetime.now(timezone.utc)
+        time_diff = datetime.datetime.now(timezone.utc) - published_time
         time_ago_days = time_diff.days
         time_ago = f"{time_ago_days} days ago" if time_ago_days > 0 else "today"
 
@@ -487,7 +489,6 @@ with demo:
 
             Once your paper is submitted, it will automatically appear in this demo.
             """)
-
         # Header with Refresh Button
         with gr.Row():
             gr.HTML("""
@@ -504,7 +505,6 @@ with demo:
                 </tr>
             </table>
             """)
-
         # Sort Options
         with gr.Row():
             sort_radio = gr.Radio(
@@ -513,10 +513,8 @@ with demo:
                 label="Sort By",
                 interactive=True
             )
-
         # Paper list
         paper_list = gr.HTML()
-
         # Navigation Buttons
         with gr.Row():
             prev_button = gr.Button("Prev")