write the app.py and upload data

app.py

@@ -9,7 +9,7 @@ import os
 
 openai.api_key = os.getenv('API_KEY')
 
-timezone = datetime.tz.gettz('Asia/Shanghai')
+timezone = datetime.timezone.gettz('Asia/Shanghai')
 timestamp2string = lambda timestamp: datetime.datetime.fromtimestamp(timestamp).replace(tzinfo=timezone).strftime('%Y-%m-%d %H:%M:%S')
 
 def num_tokens_from_messages(messages, model="gpt-3.5-turbo"):