Hi,
Would it be possible to add additional sections to the 'Summarise Tool' such as one for dates so that you might be able to group by Year, Month, Quarter, Week or a combination of all these. There are other extensions that could also be considered such as group with nulls or without that would make this tool far more usable and not dependent on data manipulation prior to it; you might offer to have all nulls grouped and called something else for readability and this shouldn't be very hard at all to implement.
Kind regards,
Peter