def _set_TS_index(self, data):
        """ Convert index to datetime and all other columns to numeric

        Parameters
        ----------
        data    : pd.DataFrame()
            Input dataframe. 

        Returns
        -------
        pd.DataFrame()
            Modified dataframe.

        """
        
        # Set index
        data.index = pd.to_datetime(data.index, error= "ignore")

        # Format types to numeric
        for col in data.columns:
            data[col] = pd.to_numeric(data[col], errors="coerce")

        return data