title: How do disable only dates from previeous month
body: <p>I have a simple section in which I am showing a calendar for my users using full calendar API, I want to disable only the dates from the previous month.</p>
  
  <p>JSFIDDLE <a href="http://jsfiddle.net/5dfe2ypu/1/" rel="nofollow noreferrer">demo</a></p>
  
  <p>The expected result </p>
  
  <p><a href="https://i.stack.imgur.com/WLeyC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WLeyC.png" alt="enter image description here"></a></p>
  
  <p>Here is what I have tried so far using full calendar documentation
  HTML</p>
  
  <pre><code>&lt;div id="calendar"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>JS</p>
  
  <pre><code>$('#calendar').fullCalendar({
      header: {
          left: 'prev,next today',
          center: 'title',
          right: 'month,agendaWeek,agendaDay'
      },
               selectable: true,
                    selectAllow: function(selectInfo) {
                        console.log(selectInfo);
                      return moment().diff(selectInfo.start) &lt;= 0
                    },  
      // set source and define start and end params
      events: [
          {
              id: "1",
              title: "First event",
              start: "20120-03-26 13:00:00",
              end: "2020-03-26 15:00:00",
              className: 'available'
          },
          {
              id: "2",
              title: "Second event",
              start: "2020-03-29 18:00:00",
              end: "2020-03-29 20:00:00",
  
          }
      ],
  
  });
  </code></pre>
  
  <blockquote>
    <p>NOTE: am using full calendar v4</p>
  </blockquote>
  
  <p>Unfortunately, my solution disable all past dates but I just want only dates from past month should be disabled </p>
  
  <p>What do I need to do to achieve what I want?</p>