Get month name with javascript

Hello everyone,

I'm a nooby in coding so I need your help. I would like to get the month name when i'm lauching this script in illustrator. For the moment when I launch the script I get this: 08/2022
I would like to get this: august 2022
Thank you

var WR="Concepteur SAI - ";

var AIversion=version.slice(0,2);

var format_preset = "N.F.X 08-070 DE JUIN 2013 DATE DE CONCEPTION DU PLAN: {DATE} - {FILENAME}";

var MSG_unsetmark = WR+"This object is marked as actual date'n'time, do you want to remove the mark?";
var MSG_setmark = WR+"Do you want to mark the selected textobject as actual date'n'time?";
var MSG_askformat = WR+"Do you want to mark the textobject as actual date'n'time? Formats:\n{DATE} - {TIME} - {FILE} - {FILEPATH} - {FILENAME} and {FILEEXT}:"
var MSG_editformat = WR+"Edit date'n'time (empty = remove). Formats:\n{DATE}, {TIME}, {FILE}, {FILEPATH}, {FILENAME} and {FILEEXT}:"
var MSG_notexto = WR+"Pas de texte!";
var MSG_selectedmany = "Vous devez dans un premier temps selectionner le texte du concepteur avant d'exécuter ce script.";
var MSG_nodocs = WR+"Vous n'avez pas de document ouvert."
var Timeformat = 24;
var TimeSep = ":";
var AM = " am";
var PM = " pm";
var Dateformat = "mm/yyyy";

var error=0;

if (documents.length<1) {
error++;
alert(MSG_nodocs)
}

if (error < 1) {
date_n_time();
}

function TodayDate()
{
var Today = new Date();
var Day = Today.getDate();
var Month = Today.getMonth() + 1;
var Year = Today.getYear();
var PreMon = ((Month < 10) ? "0" : "");
var PreDay = ((Day < 10) ? "0" : "");
if(Year < 999) Year += 1900;

var theDate = Dateformat.replace(/dd/,PreDay+Day);
theDate = theDate.replace(/mm/,PreMon+Month);
theDate = theDate.replace(/d/,Day);
theDate = theDate.replace(/m/,Month);
theDate = theDate.replace(/yyyy/,Year);
theDate = theDate.replace(/yy/,Year.toString().substr(2,2));

return theDate;
}

function TodayTime()
{
var Today = new Date();
var Hours = Today.getHours();
var Minutes = Today.getMinutes();
var Suffix = "";
if (Timeformat == 12) {
if (Hours >= 12 ) {
Suffix = PM;
} else {
Suffix = AM;
}
if (Hours >= 13) {
Hours = Hours - 12;
}
if (Hours < 1) {
Hours = Hours + 12;
}
}
var PreHour = ((Hours < 10) ? "0" : "");
var PreMin = ((Minutes < 10) ? "0" : "");
return PreHour+Hours+TimeSep+PreMin+Minutes+Suffix;
}

function DateUpdate(Name) {
var docpath = activeDocument.path.fsName;
var docname = activeDocument.name.replace(/(.*?)(?:\.([^.]+))?$/,'$1');
var extension = activeDocument.name.replace(/(.*?)(?:(\.[^.]+))?$/,'$2');
if (docpath.slice(2,3) == "\\") {
docsep = "\\";
} else {
docsep = ":";
}
var content = Name.slice(11);
var content = content.replace(/\{FILE\}/,docpath+docsep+docname);
var content = content.replace(/\{FILEPATH\}/,docpath);
var content = content.replace(/\{FILENAME\}/,docname);
var content = content.replace(/\{FILEEXT\}/,extension);
var content = content.replace(/\{DATE\}/,TodayDate());
var content = content.replace(/\{TIME\}/,TodayTime());
return content;
}

function date_n_time()
{
if (selection.length == 1) {
if (selection[0].typename == "TextArtItem" || selection[0].typename == "TextFrame") {
if (selection[0].name.slice(0,11) == "actualDate:") {
dateformat = selection[0].name.slice(11);
Check = false;
if (AIversion == "10") {
Check = confirm( MSG_unsetmark );
} else {
dateformat = prompt(MSG_editformat, dateformat);
}
if(dateformat != "" && Check) {
selection[0].contents = selection[0].name.slice(11);
selection[0].name="";
selection[0].selected = false;
}
if(dateformat == "" && !Check) {
selection[0].name="";
selection[0].selected = false;
}
if(dateformat && dateformat !="" && !Check) {
selection[0].name="actualDate:"+dateformat;
selection[0].contents = DateUpdate(selection[0].name);
}
} else {
dateformat = selection[0].contents;
if(dateformat.search(/\{DATE\}/) == -1 && dateformat.search(/\{TIME\}/) == -1 && dateformat.search(/\{FILE[A-Z]*\}/) == -1) dateformat = format_preset;
Check = false;
if (AIversion == "10") {
Check = confirm( MSG_setmark );
} else {
dateformat = prompt(MSG_askformat, dateformat);
}
if (dateformat || Check) {
selection[0].name="actualDate:"+dateformat;
selection[0].contents = DateUpdate(selection[0].name);
selection[0].selected = false;
}
}
} else {
alert ( MSG_notexto );
}
} else if (selection.length > 1) {
alert ( MSG_selectedmany );
} else {
if (AIversion == "10") {
var textArtItems = activeDocument.textArtItems;
for (var i = 0 ; i < textArtItems.length; i++)
{
if (textArtItems[i].name.slice(0,11) == "actualDate:") {
textArtItems[i].selected = true;
textArtItems[i].contents = DateUpdate(textArtItems[i].name);
}
}
} else {
var textFrames = activeDocument.textFrames;
for (var i = 0 ; i < textFrames.length; i++)
{
if (textFrames[i].name.slice(0,11) == "actualDate:") {
textFrames[i].selected = true;
textFrames[i].contents = DateUpdate(textFrames[i].name);
}
}
}
}
}