Сделал вот так:
<script type="text/javascript">
var todaytmp = "<?php echo $_GET['today']; ?>";
var __lead0 = function (s) {
return ((s + '').length < 2) ? '0' + s : s;
};
today = '' + __lead0(todaytmp.getFullYear()) + __lead0(todaytmp.getMonth() + 1) + __lead0(todaytmp.getDate()) + __lead0(todaytmp.getHours()) + __lead0(todaytmp.getMinutes()) + __lead0(todaytmp.getSeconds()) + __lead0(todaytmp.getMilliseconds());
alert(today);
</script>
почему то ничего не выводит..