title: add random dates in 400K pandas dataframe
body: <p>Trying to append a fourth column to the following dataframe of length <code>465017</code>. </p>
  
  <pre><code>     0        1     2
  0   228055  231908  1
  1   228056  228899  1
  </code></pre>
  
  <p>Running following syntax</p>
  
  <pre><code>x["Fake_date"]= fake.date(pattern="%Y-%m-%d", end_datetime=None)
  </code></pre>
  
  <p>returns</p>
  
  <pre><code>     0        1    2    Fake_date
  0   228055  231908  1   1980-10-12
  1   228056  228899  1   1980-10-12
  </code></pre>
  
  <p>but I want different random dates on <code>465017</code> rows for an instance, </p>
  
  <pre><code>      0       1    2    Fake_date
  0   228055  231908  1   1980-10-11
  1   228056  228899  1   1980-09-12
  </code></pre>
  
  <p>How do I randomize this? </p>