When Business Time Unit is set to 'Day', the Monthly view is worksheets is 30 -day buckets

Hi -

To meet business requirements, we are using Business Time Unit  = Day in the Data Model.  However, when we set the time to 'Month' on worksheets, the data is displayed in 30-day buckets and not Calendar Months.  Is this expected functionality?  Is there any way to view the data in Calendar Months in Worksheets when BTU = Day? (i.e. aside from setting BTU = Month; we cannot use BTU = Month due to other business req'ts)

Thanks