title: How to filter by month, day, year with Pandas
body: <p>I create the DataFrame with:</p>
  
  <p><code>df = pandas.read_csv("data.csv", sep=';', parse_dates = 1, dayfirst = True)</code></p>
  
  <p>I then get the following results:</p>
  
  <pre><code>                   Qty     System_created             Total
  0                   2  2014-10-14 08:13:46.000         21.76  
  1                   1  2014-10-14 08:13:46.000          4.16  
  2                   2  2014-10-14 08:30:46.000         27.90  
  3                   1  2014-10-14 08:30:46.000          4.95  
  4                   1  2014-10-14 08:30:46.000          4.95  
  5                   2  2014-11-05 11:15:47.000         21.76  
  6                   1  2014-11-05 11:15:48.000          3.32  
  </code></pre>
  
  <p>But I do not know how to filter by month(or year, day, hour etc...). Something like <code>df[df["System_created"].day]</code> would be ideal. Is that possible?</p>