What is the desired functionality that you are missing?

• Currently date buckets can be only set for start & end date of process instances (e.g. group by day, month, year). It is not possible for date variables, but for those it's currently automatically adjusted.
• It should be possible to configured the buckets for date variables, too.

Which problem are you going to solve with this functionality?

• As a User I want to defined how large the buckets should be - often I am not interested in granular buckets, but just look at a whole quarter or year. This is not possible for date variables yet.