Due and Overdue columns in FSCM work list

Hi experts,

In FSCM worklist, there are different fields available for due and overdue ranges in days. See print below.

These fields are in data type UDM_S_WORKLIST_ITEM_ATTR_C as I'm right!?

My question is: is it possible to change the range of the fields?

First field is 0-30 days, next 31-60 and so on.

I would like to change it to 61-75 days, 91-180 and > 180.

Is this possible?

How/where are the fields calculated?

Thanks!