รบกวนอธิบายโค้ตให้หน่อยครับว่ามันทำงานยังไง งงมากไม่ถนัด java เลยอ่ะครับ

var chkDate = dateAdd(ETA, "d", 1);
var dayChk = getDayNumber(chkDate,"w");
var leadTime = 0;
var grpLeadTime = "None";
var grpRemark_LTE35 = 0;
var grpRemark_LTE50 = 0;
var grpRemark_MT50 = 0;


while (dateDiff(chkDate, DeliveryDate, "d") >= 0)
{
	dayChk = getDayNumber(chkDate,"w");
	if ((dayChk!=1) && (dayChk!=7)) {
		leadTime++;
	}
	chkDate = dateAdd(chkDate, "d",1);
}

if (leadTime==4)
{
	leadTime=3.5;
}

grpRemark_LTE35 = 0;
grpRemark_LTE50 = 0;
grpRemark_MT50 = 0;
if (leadTime <= 3.5) {
	grpLeadTime = "LTE3.5";
	if (REMARK) {
		grpRemark_LTE35 = 1;
	}
}
else if (leadTime <= 5) {
	grpLeadTime = "LTE5.0";
	if (REMARK) {
		grpRemark_LTE50 = 1;
	}
}
else {
	grpLeadTime = "MT5.0";
	if (REMARK) {
		grpRemark_MT50 = 1;
	}
}