diff --git a/emission/analysis/result/user_stat.py b/emission/analysis/result/user_stat.py
index 1fe983d51..523c1a6aa 100644
--- a/emission/analysis/result/user_stat.py
+++ b/emission/analysis/result/user_stat.py
@@ -9,39 +9,6 @@
 
 TIME_FORMAT = 'YYYY-MM-DD HH:mm:ss'
 
-def get_time_series(user_id: str) -> esta.TimeSeries:
-    """
-    Fetches the time series data for a given user.
-
-    :param user_id: The UUID of the user.
-    :type user_id: str
-    :return: The time series object.
-    :rtype: esta.TimeSeries
-    """
-    logging.debug(f"Fetching time series for user_id: {user_id}")
-    return esta.TimeSeries.get_time_series(user_id)
-
-
-def get_timestamp(ts: esta.TimeSeries, trip_key: str, field: str, sort_order: int) -> Optional[int]:
-    """
-    Retrieves a timestamp from the time series.
-
-    :param ts: The time series object.
-    :type ts: esta.TimeSeries
-    :param trip_key: The key representing the trip data.
-    :type trip_key: str
-    :param field: The specific field to retrieve.
-    :type field: str
-    :param sort_order: Sorting order (pymongo.ASCENDING or pymongo.DESCENDING).
-    :type sort_order: int
-    :return: The timestamp or None if not found.
-    :rtype: Optional[int]
-    """
-    timestamp = ts.get_first_value_for_field(trip_key, field, sort_order)
-    logging.debug(f"Retrieved {field}: {timestamp}")
-    return None if timestamp == -1 else timestamp
-
-
 def count_trips(ts: esta.TimeSeries, key_list: list, extra_query_list: Optional[list] = None) -> int:
     """
     Counts the number of trips based on the provided query.
@@ -78,20 +45,6 @@ def get_last_call_timestamp(ts: esta.TimeSeries) -> Optional[int]:
     return None if last_call_ts == -1 else last_call_ts
 
 
-def format_timestamp(ts: int) -> str:
-    """
-    Formats a timestamp using the predefined time format.
-
-    :param ts: The timestamp to format.
-    :type ts: int
-    :return: The formatted timestamp.
-    :rtype: str
-    """
-    formatted = arrow.get(ts).format(TIME_FORMAT)
-    logging.debug(f"Formatted timestamp: {formatted}")
-    return formatted
-
-
 def update_user_profile(user_id: str, data: Dict[str, Any]) -> None:
     """
     Updates the user profile with the provided data.
@@ -121,10 +74,12 @@ def get_and_store_user_stats(user_id: str, trip_key: str) -> None:
     try:
         logging.info(f"Starting get_and_store_user_stats for user_id: {user_id}, trip_key: {trip_key}")
 
-        ts = get_time_series(user_id)
+        ts = esta.TimeSeries.get_time_series(user_id)
+        start_ts_result = ts.get_first_value_for_field(trip_key, "data.start_ts", pymongo.ASCENDING)
+        start_ts = None if start_ts_result == -1 else start_ts_result
 
-        start_ts = get_timestamp(ts, trip_key, "data.start_ts", pymongo.ASCENDING)
-        end_ts = get_timestamp(ts, trip_key, "data.end_ts", pymongo.DESCENDING)
+        end_ts_result = ts.get_first_value_for_field(trip_key, "data.end_ts", pymongo.DESCENDING)
+        end_ts = None if end_ts_result == -1 else end_ts_result
 
         total_trips = count_trips(ts, key_list=["analysis/confirmed_trip"])
         labeled_trips = count_trips(
@@ -148,10 +103,6 @@ def get_and_store_user_stats(user_id: str, trip_key: str) -> None:
             "labeled_trips": labeled_trips
         }
 
-        if last_call_ts is not None:
-            formatted_last_call = format_timestamp(last_call_ts)
-            update_data["last_call"] = formatted_last_call
-
         update_user_profile(user_id, update_data)
 
         logging.debug("User profile updated successfully.")