Weekly Gross Profit by project

Thanks for the article is really good but still does not help me to resolve my current issue because I don't have a transaction per day. I have a transaction that starts one day and ends in the future and I need to show how it rolls through that entire period of time. let's forget about the week concept, if the project is active through one month I need to see the daily GP every day, although I don't have 1 line per day, I only have a starting point and an endpoint. after accomplishing that I can aggregate it into weeks, months, etc..