title: MomentJS: how to get last month date (not start of the month)?
body: <p>I'm using <code>MomentJS</code> to handle dates in my project.
  I need to get last month date starting from current date.</p>
  
  <p>I mean if today is 6th April, when I click on some button I should get a period between 7th March and 6th April. The same should happen if, for example, today is 15th March: in this case I should get a period that is between 16th February and 15th March.</p>
  
  <p>I read the MomentJS documentation and I found these methods:</p>
  
  <pre><code>moment().subtract(1,'months');
  
  moment().subtract(30, 'days');
  </code></pre>
  
  <p>As you can see they can't suit for my needs.</p>
  
  <p>Any idea?</p>