Simple jQuery Clock with Timezone Offset Support

//quick code to create one or more clocks on a site with the ability to adjust each one given a UTC offset (in seconds)
//sample HTML
//  <span class="clock"><!-- UTC time --></span>
//  <span class="clock" data_offset="-10800"><!-- UTC-3 --></span>

$(function() {
    init_clocks( );
});

var clock_update_timer;
var weekday = new Array(7);
weekday[0]=  'Sun';
weekday[1] = 'Mon';
weekday[2] = 'Tues';
weekday[3] = 'Wed';
weekday[4] = 'Thurs';
weekday[5] = 'Fri';
weekday[6] = 'Sat';
function init_clocks( ){
    if($('.clock').length == 0){ return; }

    update_clocks( );

    //just in case
    clearInterval(clock_update_timer);
    clock_update_timer = setInterval(update_clocks, 1000);
}

function update_clocks( ){
    $('.clock').each(function( ){
        offset_seconds = parseInt($(this).data('offset'));

        utc = new Date( );

        currentTime = new Date((new Date(utc.getUTCFullYear( ), utc.getUTCMonth( ), utc.getUTCDate( ), utc.getUTCHours( ), utc.getUTCMinutes( ), utc.getUTCSeconds( ))).getTime( ) + (offset_seconds * 1000));
        currentHours = currentTime.getHours( );
        currentMinutes = currentTime.getMinutes( );
        currentSeconds = currentTime.getSeconds( );

        currentWDay = weekday[currentTime.getDay( )];

        timeOfDay = (currentHours < 12) ? 'am' : 'pm';

        currentHours = (currentHours > 12) ? currentHours - 12 : currentHours;
        currentHours = (currentHours == 0) ? 12 : currentHours;

        currentHours = (currentHours < 10 ? '0' : '') + currentHours;
        currentMinutes = (currentMinutes < 10 ? '0' : '') + currentMinutes;
        currentSeconds = (currentSeconds < 10 ? '0' : '') + currentSeconds;

        // Compose the string for display
        currentTimeString = currentWDay + ' ' + currentHours + ':' + currentMinutes + ':' + currentSeconds + ' ' + timeOfDay;

        $(this).text(currentTimeString);
    });
}