Update pyfolio/mcp_output/mcp_plugin/mcp_service.py

pyfolio/mcp_output/mcp_plugin/mcp_service.py

@@ -79,12 +79,9 @@ def _save_plot_as_base64(plt, plot_name):
 def _convert_to_series(data: List[float], name: str = "returns") -> pd.Series:
     """Convert list to pandas Series with date index."""
     if isinstance(data, list):
-        # Create a business day date range to avoid NaT issues
-        try:
-            date_index = pd.date_range("2020-01-01", periods=len(data), freq="B")
-        except Exception:
-            # Fallback to daily frequency if business day fails
-            date_index = pd.date_range("2020-01-01", periods=len(data), freq="D")
+        # Create a simple daily date range without frequency constraints
+        start_date = pd.Timestamp("2020-01-01")
+        date_index = pd.date_range(start=start_date, periods=len(data))
         
         return pd.Series(
             data,