title: How can I concatenate dates in python?
body: <p>I want to concatenate dates between a specific time period, i.e 2017.08.15 - 2018.08.15, and I want this in string formats in a list or a set:</p>
  
  <pre><code>("2017.08.15", "2017.08.16", ...)
  </code></pre>
  
  <p>Is there a way to concatenate dates?</p>