Combine multiple refresh dates from different reports into one?

I am trying to create a landing page that combines the refresh dates of multiple dashboards. In each of the individual dashboards, I have those refresh dates. I essentially want to combine all of these refresh dates into one new table, and use that to report out on in a new dashboard.

How would I go about doing this efficiently? 

For example:

Dataset A:

Dataset B:

New Dataset to build: