title: How do I find last monday using momentjs?
body: <p>I need to work with some logic that requires week begins on Monday (not Sunday).</p>
  
  <p>There is a function start of week I can use:</p>
  
  <p><code>moment().tz('America/Los_Angeles').startOf('week').add(1, 'day')</code></p>
  
  <p>However if its Sunday, I need to use last week's date and add 1 to get monday.</p>
  
  <p>I'm hoping there is an easier to just get "last monday" no matter what the date is.</p>