Fun challenge! While reviewing the solution file, I noticed a couple of things:
- There is some ambiguity regarding the date range of orders that we should be using. I interpreted "orders since June 1, 2013" as orders with a date greater than and including June 1st, 2013. I see the description is updated on this post to say July; however, within the challenge file, the instructions still say June, so that's what I went with.
- My approach was different than the solution file. I did not create a secondary lookup table or parse the dates.