Fast (low-footprint) javascript clock

I'm trying to create a live clock based on javascript.

The important part is that it keeps a low memory footprint, meanwhile staying accurate at the same time.

This is my code:

<div id="time">...</div>

<script type="text/javascript">

    // I'm actually using a better name for such a global variable.
    // Here I'm presuming a lookup in a global variable is faster than to a local one
    var weekdays={"0":"Sun","1":"Mon","2":"Tue","3":"Wed","4":"Thur","5":"Fri","6":"Sat"};

    function refTime(){
      // get current time stamp
      var date=new Date();
      // add an hour so we get UTC+1
      date.setUTCHours(date.getUTCHours()+1) // UTC+1
      // store time components separately
   开发者_运维知识库   var day=date.getUTCDay(),
          hrs=date.getUTCHours(),
          min=date.getUTCMinutes(),
          sec=date.getUTCSeconds(),
          mer=false;
      // find meridiem and reduce 24h to 12h
      hrs=(mer=hrs<12) ? hrs : hrs-12;
      // generate the markup
      document.getElementById('time').innerHTML
        =weekdays[day]+'<br/>'+day+'<br/>'
        +(hrs<10?'0':'')+hrs+':'+(min<10?'0':'')+min+':'
        +(sec<10?'0':'')+sec+' '+(mer ? 'am' : 'pm');
    } // end format is: "Tue<br/>19<br/>11:43:25 am"
    setInterval(refTime,1000);

</script>

Can it be further optimized?

Notes: https://developer.mozilla.org/en/JavaScript/Reference/global_objects/date

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Why not use one of the Date toYYYString() methods and String.split() to get the appropriate fields.

What's so special about UTC+1? If the user is in North America or Asia, they'll still want UTC+1?

You could detect the browser and handle the couple of different date formats. Different broser Date.toYYYString() method results: http://home.clara.net/shotover/datetest.htm