How to add days to shown current date (display date in future).

[Bsan]

Can someone tell me how to add 46-days to the HTML under that shows the current date?
So instead of 9 Jan 2025 (today) its should show 24 Feb 2025. Many thanks in advace? I'm just a beginner at coding.

<SCRIPT TYPE="text/javascript" LANGUAGE="JavaScript">
<!--

function initArray() {
this.length = initArray.arguments.length;
for (var i = 0; i < this.length; i++)
this[i+1] = initArray.arguments;
}

var dagArray = new initArray("zondag","maandag", "dinsdag","woensdag","donderdag","vrijdag","zaterdag");

var maandArray = new initArray("januari","februari","maart","april","mei","juni","juli", "augustus","september","oktober","november","december");

var nu = new Date();
var dagtekst = dagArray[(nu.getDay()+1)];
var dag = nu.getDate();
var maandtekst = maandArray[(nu.getMonth()+1)];
var jaar = nu.getYear();
var jaar4 = ((jaar < 1900) ? (jaar + 1900) : (jaar));

var datumweergave = "Eerste mogelijkheid ná: " + dagtekst + " " + dag + " " + maandtekst + " " + jaar4;

document.write(datumweergave);

//-->
</SCRIPT>