Okay, to me, this is gonna be a toughy formula. In Excel, no problem. Alteryx - I hardly know where to begin. So, to set the stage, here's a snip:

So, for example, pretend this is client #1 and 2(separated by the long line in between), I am trying to get like, Server History: End Date of 7/15/2010 to subtract from Server History: Effective Date of 10/4/2012. As you can see here, some would be 4/17/2016 - 4/18/2016 = 1 day. I'm trying to filter out anything greater than 1-day.
As far as I've gotten is I know I need to sort ascending by like Client ID, Server History: Effective Date then Server History: End Date. Beyond that - let's just say UGH!