title: how select data with last month on postgres
body: <p>I have data with a <code>column</code> with dates, how do I output all records that have a last date <code>Monday, January 29, 2018 12:00 AM</code>?</p>
  
  <pre><code>| 1 | Monday, January 29, 2018 12:00 AM | 
  | 2 | Monday, January 29, 2018 12:00 AM | 
  | 3 | Monday, January 29, 2018 12:00 AM | 
  | 4 | Monday, January 28, 2018 12:00 AM | 
  | 5 | Monday, January 28, 2018 12:00 AM | 
  | 6 | Monday, January 28, 2018 12:00 AM | 
  | 7 | Monday, January 27, 2018 12:00 AM | 
  | 8 | Monday, January 27, 2018 12:00 AM | 
  | 9 | Monday, January 27, 2018 12:00 AM | 
  </code></pre>