title: Using Featuretools to aggregate per time time of day
body: <p>I'm wondering if there's any way to calculate all the same variables I already am using deep feature synthesis (ie counts, sums, mean, etc) for different time segments within a day? </p>
  
  <p>I.e. count of morning events (hours 0-12) as a separate variable from evening events (13-24).</p>
  
  <p>Also, within the same vein, what would be the easiest to get counts by day of week, day of month, day of year, etc. Custom aggregate primitives?</p>