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$uhrzeit = date("H:i"); // Ausgabe: z.B. 14:02
bzw.

$stunden = date("H"); 
$minuten = date("i"); 
und das dann mit 
echo 'var stunden = '.$stunden.';\n';
echo 'var minuten = '.$minuten.';\n';
in den JavaScript laden

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fon_size=3
fon_famil="Tahoma"
fon_width=8

var ns=document.layers?1:0
var ie4=document.all?1:0
var ns6=document.getElementById&&!document.all?1:0

function tab_wri(nam_tab)
{
	if(!ns)
	{
		document.write ("
")
		for (i=0; i<10; i++){document.write ("
"+i+"
")}
		document.write ("
")
	}
	else
	{
		document.write ("")
		for (i=0; i<10; i++){document.write(""+i+"")}
		document.write ("")
	}
}
function see_num(nam_tab,num_tab)
{
	if(ie4)
	{
		for(i=0; i<10; i++)
	{
		if(i==num_tab){document.all["tab"+nam_tab+"_n"+num_tab].style.visibility="visible"}
		else{document.all["tab"+nam_tab+"_n"+i].style.visibility="hidden"}
	}
}
if(ns)
{
	for(i=0; i<10; i++)
	{
		if(i==num_tab){document.layers["ilay"+nam_tab].document.layers["lay"+nam_tab+"_n"+num_tab].visibility="show"}
		else{document.layers["ilay"+nam_tab].document.layers["lay"+nam_tab+"_n"+i].visibility="hide"}
	}
}
if(ns6)
{
	for(i=0; i<10; i++)
	{
		if(i==num_tab){document.getElementById("tab"+nam_tab+"_n"+num_tab).style.visibility="visible"}
		else{document.getElementById("tab"+nam_tab+"_n"+i).style.visibility="hidden"}
	}
}

}
sec_old="0"
function see_tim()
{
	date_=new Date()
	wr_s=date_.getSeconds()+""

	if(sec_old==wr_s){return}

	sec_old=wr_s
	wr_h=date_.getHours()+""
	wr_m=date_.getMinutes()+""

	if (wr_h.length==2){see_num(1,wr_h.charAt(0)); see_num(2,wr_h.charAt(1))}
	else{see_num(1,0); see_num(2,wr_h.charAt(0))}

	if (wr_m.length==2){see_num(3,wr_m.charAt(0)); see_num(4,wr_m.charAt(1))}
	else{see_num(3,0); see_num(4,wr_m.charAt(0))}
}

document.write ("
")
tab_wri(1)
document.write ("
")
tab_wri(2)
document.write ("
:")
document.write ("
")
tab_wri(3)
document.write ("
")
tab_wri(4)
document.write ("
")

see_tim()
tim_int=window.setInterval("see_tim()",200)