Automatically filling multiple date fields

How can I automacially fill in multiple date fields when an item type is in a given state?

Ex:

When State="Sent"

Field Date01=date when state changed to sent + 0

Field Date02=date when state changed to sent + 1

Field Date03=date when state changed to sent + 2

Field Date04=date when state changed to sent + 3

Field Date05=date when state changed to sent + 4

So if State is "Sent" and the date is 7/31/2014 then field Date01 would be 8/01/2014, Date02 would be 8/02/2014 and so on.

We are using MKS Integrity 2009 SP5.

Thank you!