Dates Raking with Selection

Hello,

I have a set of orders made by different departments and I am trying to rank them according to the sequence of orders (1st, 2nd, 3rd, ...) and the dates.

Here's a sample of the data

If I want to choose only departments A and B, I should get this

B, D, and E

etc.

I saw this post http://community.powerbi.com/t5/Desktop/DAX-Ranking-or-Indexing-Dates/m-p/41239#M15579 but couldn't get to the solution I want.

Any help is appreciated.
Thank you.