I have found only one option to change data format for export from XLS to CSV. This option is to specify CsvDocumentExporterOptions.Culture option.
But this option does not allow to override cell formating strings specified by a XLS author.
For example if for a cell with date a format string 'TT. MMM JJ' (dd. mmm yy) is specified, there is no way to export complete year like 2020, or month number instead of month name.
It would be nice to have possibility to specify own formating strings for exported data of different types.
Or maybe do you already have such possibility?