Ability to set a custom date range for custom date attributes

As I build custom standard calculated attributes for date attributes, I would like the ability to set a custom date range for those custom date attributes, so that I can easily filter date ranges on my custom attributes in the same way that I can for the default (built-in) date attributes.

For example, reports for my organization call for an adjusted start of the week on Fridays other than the default Monday. This requires a standard calculated attribute to be created to create a new attribute where the week starts on a different day. However, my custom date attribute cannot be filtered with a range like the built-in week attribute can.