title: Calculate days left to a specific date with JavaScript
body: <p>I was trying to calculate the days left until a specific date. I know that there are a million different approaches and tutorials about it, but I wanted to write a code by myself. The problem is that the output of the function is "NaN". I am very thankful for your help.</p>
  
  <p>This is my code:</p>
  
  <pre><code>var daysLeft = function(input) {
      var num = '';
      var date = [];
      var x = 0;
      for (i = 0; i &lt; input.length; i++) {
          if (!isNaN(input.charAt(i))) {
              num += input.charAt(i);
          }
          else {
              date[x] = parseInt(num, 10);
              x++;
          }
      }
      var inputDate = new Date(date[2], date[1], date[0]);
      var today = new Date();
      var timeDiff = Math.abs(inputDate.getTime() - today.getTime());
      return Math.ceil(timeDiff / (1000*3600*24));
  };
  
  daysLeft("11.12.2014"); 
  </code></pre>
  
  <p>BTW: I wrote this code, because the Date() function works with the American format of Dates (MM/dd/YYYY) and not with UTC dates. I am also aware that there is the Date.UTC() function, but anyway. I just wanted to turn around months and days myself.</p>