Matching to the largest number smaller than X

Hi. I have a column of consecutive dates:

Data set 1

I have another data set where each row is an "activity", and the columns are "activity description" and "date"

Data set 2

What I want to do is create a new dataset, which is basically the same as "Data set 1" (i.e. the first column will be every date from Jan 1 to Dec 31), but the second column will be whatever the last activity to occur was (i.e. for a given row/date, what is the largest date in "Data set 2" that is less than the date in the new row). So, as an example, it would look something like this:

Data set 3

Is there a simple way to do this type of matching in Alteryx? 

Thanks in advance,
Dan