title: Range of 3 month to 2 date pickers
body: <p>i have 2 input type date one is the start date the other one is the end date but i want to make a range of 3 month. For example if a user choses the start date as 12/09/2018 the second datepicker should only allow him to choose 12/12/2018.
  Any idea how to do it? </p>
  
  <pre><code>&lt;div class="form-group"&gt;
          &lt;label for="Sdate" &gt;&lt;strong style=" color:DarkSlateBlue" &gt; Start date &lt;/strong&gt;&lt;/label&gt;
          &lt;input type="date" class="form-control" id="sdate" name="startdate" required&gt;
      &lt;/div&gt;
  
   &lt;div class="form-group"&gt;
          &lt;label for="Edate"&gt;&lt;strong style=" color:DarkSlateBlue" ;&gt; End date &lt;/strong&gt;&amp;nbsp;&lt;/label&gt;
          &lt;input type="date" class="form-control" id="edate" name="enddate" required&gt;
      &lt;/div&gt;
  </code></pre>