title: JQuery UI datepicker strange problem (happens in Firefox)
body: <p>I use the following function to disable days from 2011-02-13 to 2011-02-18 in the date picker calendar:</p>
  
  <pre><code>function no_disabled_days(date){
                 dateStr1 = '2011-02-13';                   
                 dateStr2= '2011-02-18';
  
                 disabled_start_day = new Date(dateStr1);
                 disabled_end_day = new Date(dateStr2);
  
                 if(date &gt;= disabled_start_day &amp;&amp; date &lt;= disabled_end_day){
                     return [false];
                 }
  
  
               return [true];
  
    }
  
  $("#reserve_date").datepicker({
              beforeShowDay: no_disabled_Days
  });
  </code></pre>
  
  <p>For example, if <strong>dateStr1='2011-02-13'</strong>, <strong>dateStr2='2011-02-18'</strong>, the days from <strong>2011-02-13</strong> to <strong>2011-02-18</strong> are <strong>disabled</strong>. </p>
  
  <p>Since I use </p>
  
  <p><code>if(date &gt;= disabled_start_day &amp;&amp; date &lt;= disabled_end_day)</code> (Notice the '<strong>=</strong>' sign) </p>
  
  <p>so, '<strong>2011-02-13</strong>' and '<strong>2011-02-18</strong>' are disabled. </p>
  
  <p>Things are working fine in <strong>Chrome</strong> browswer, however, when I test in <strong>Firefox</strong>, the exact <code>disable_start_date</code> is not disabled, that's '<strong>2011-02-13</strong>' is not disabled, other days are working properly. Why? </p>
  
  <p>Why the <strong>disabled start date</strong> (<strong>2011-02-13</strong>) is not in disable status in firefox?</p>