title: Convert numpy array to list of datetimes
body: <p>I have a 2D array of dates of the form:</p>
  
  <pre><code>[Y Y Y ... ]
  [M M M ... ]
  [D D D ... ]
  [H H H ... ]
  [M M M ... ]
  [S S S ... ]
  </code></pre>
  
  <p>So it looks like</p>
  
  <pre><code>data = np.array([
      [2015, 2015, 2015, 2015, 2015, 2015], # ...
      [   1,    1,    1,    1,    1,    1],
      [   1,    1,    1,    2,    2,    2],
      [  23,   23,   23,    0,    0,    0],
      [   4,    5,    5,   37,   37,   37],
      [  59,    1,    2,   25,   27,   29]
  ])
  </code></pre>
  
  <p>What would be the best way to convert this into one list of datetime objects?</p>