Fix deprecation warning

Author: mesca

timeflux_ui/nodes/ui.py

@@ -268,7 +268,8 @@ def _to_dict(self, data):
     def _from_dict(self, data):
         try:
             data = pd.DataFrame.from_dict(data, orient="index")
-            data.index = pd.to_datetime(data.index, unit="ms")
+            print(data.index)
+            data.index = pd.to_datetime(data.index.astype(np.float64), unit="ms")
         except ValueError:
             self.logger.warn("Invalid stream data")
             return None