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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  Last run: <span id="time"></span><br>
  Next execution: <span id="target"></span>
<script type="text/javascript">
    function executeMe(){
      alert("1:20am!");
    }
    var timeout = null;
    var interval = null;
    function timer(){
      var now = new Date();
      document.getElementById('time').innerHTML = now;
      document.getElementById('target').innerHTML = new Date(now.getTime()+ 1*60*60*1000);
      //console.log("timer()", now);
​
      if(now.getHour() == 1)
        setTimeout("executeMe();", 20*60*1000); // !!!! this will execute at 1:20am
​
      if(interval == null)
        interval = setInterval("timer()",1*60*60*1000); // !!!! repeat every hour
    }
​
    var now = new Date();
​
    // !!!! targeting next exact hour
    var target = new Date(now.getFullYear(),now.getMonth(),now.getDate(),now.getHours()+1,0,0,0);
    //console.log("now", now);
    //console.log("target", target);
    //console.log("diff", target.getTime() - now.getTime());
    document.getElementById('target').innerHTML = target;
    timeout = setTimeout("timer()", target.getTime() - now.getTime() );
  </script>
</body>
</html>
​
Output 300px

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