write the app.py and upload data

app.py

@@ -4,13 +4,14 @@ import tiktoken
 import collections
 import datetime
 import time
+import pytz
 import json
 import os
 
 openai.api_key = os.getenv('API_KEY')
 
-timezone = datetime.timezone.gettz('Asia/Shanghai')
-timestamp2string = lambda timestamp: datetime.datetime.fromtimestamp(timestamp).replace(tzinfo=timezone).strftime('%Y-%m-%d %H:%M:%S')
+timezone = pytz.timezone('Asia/Shanghai')
+timestamp2string = lambda timestamp: datetime.datetime.fromtimestamp(timestamp).astimezone(timezone).strftime('%Y-%m-%d %H:%M:%S')
 
 def num_tokens_from_messages(messages, model="gpt-3.5-turbo"):
     """Returns the number of tokens used by a list of messages."""