vladle
перестраховщик)
это же js, будь проще)
<h1 id="bred">x</h1>
<script type="text/javascript">
b=["0","1", "2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","Внезапно 24 0_о"]
document.getElementById('bred').innerHTML=b[new Date().getHours()]
</script>