Time ranges calculated from selected date

Hello Adobe Community,

I want to submit an idea about new Time ranges that could be calculated from a selected date.

For exemple, If I select a week on the date selection ( let's say week 52 of 2016) , my custom time range should be calculated from date selection - and wouldbe week 51 - in order to make a week to week analysis on week 52.
Time ranges can already be calculated from rolling dates, but cannot change whenever the date selection changes.
These new time ranges could facilitate the analysis of past weeks or past months  - since it would'nt be necessary to change all the time ranges from existing reports on rolling dates.

Kind regards,
and Cheers to the Adobe Community !

Mario