fix time-zone warning

src/specsscan/helpers.py

@@ -423,10 +423,10 @@ def handle_meta(
     ts_from = dt.datetime.timestamp(datetime_list[0])  # POSIX timestamp
     ts_to = dt.datetime.timestamp(datetime_list[-1])  # POSIX timestamp
     metadata["timing"] = {
-        "acquisition_start": dt.datetime.utcfromtimestamp(ts_from)
+        "acquisition_start": dt.datetime.fromtimestamp(ts_from, dt.timezone.utc)
         .replace(tzinfo=dt.timezone.utc)
         .isoformat(),
-        "acquisition_stop": dt.datetime.utcfromtimestamp(ts_to)
+        "acquisition_stop": dt.datetime.fromtimestamp(ts_to, dt.timezone.utc)
         .replace(tzinfo=dt.timezone.utc)
         .isoformat(),
         "acquisition_duration": int(ts_to - ts_from),

src/specsscan/metadata.py

@@ -92,7 +92,7 @@ def fetch_epics_metadata(self, ts_from: float, ts_to: float, metadata: dict) ->
         Returns:
             dict: Updated metadata dictionary.
         """
-        start = datetime.datetime.utcfromtimestamp(ts_from)
+        start = datetime.datetime.fromtimestamp(ts_from, datetime.timezone.utc).isoformat()
 
         # replace metadata names by epics channels
         try:
@@ -315,8 +315,8 @@ def get_archiver_data(
     Returns:
         tuple[np.ndarray, np.ndarray]: The extracted time stamps and corresponding data
     """
-    iso_from = datetime.datetime.utcfromtimestamp(ts_from).isoformat()
-    iso_to = datetime.datetime.utcfromtimestamp(ts_to).isoformat()
+    iso_from = datetime.datetime.fromtimestamp(ts_from, datetime.timezone.utc).isoformat()
+    iso_to = datetime.datetime.fromtimestamp(ts_to, datetime.timezone.utc).isoformat()
     req_str = archiver_url + archiver_channel + "&from=" + iso_from + "Z&to=" + iso_to + "Z"
     with urlopen(req_str) as req:
         data = json.load(req)