title: Split dataframe into two on the basis of date
body: <p>I have dataset  with 1000 rows like this </p>
  
  <pre><code> Date,      Cost,         Quantity(in ton),    Source,          Unloading Station
      01/10/2015, 7,            5.416,               XYZ,           ABC
  </code></pre>
  
  <p>i want to split the data on the base of date. For e.g. till date 20.12.2016 is a training data and after that it is test data.</p>
  
  <p>How should i split? Is it possible?</p>