title: Amchart: How the period range is selected?
body: <p>I'm a bit confused about how the last date is selected when we specify period. </p>
  
  <p>In <a href="https://www.amcharts.com/kbase/making-stock-charts-period-selector-input-fields-read-only/" rel="nofollow noreferrer">this</a> example when we choose <code>1 month</code> the end date is <code>27-07-2018</code> but when we choose <code>1 year</code> the end date <code>30-07-2018</code></p>
  
  <p>(Today is <code>27-07-2018</code>)</p>
  
  <p>In case of <code>1 year</code> I lose three days as the start of the period becomes <code>30-07-2017</code> but not <code>27-07-2017</code> </p>
  
  <p>I didn't find in documentation the way to specify start or end date for <code>periods</code></p>
  
  <p>Than you in advance</p>