Using Month and Year to Auto Fill Week Days with and without Saturdays - that fall in the month

this is exactly what i need

but "why the autofill of days stop working on other text fields" after i changed the format of date on first text field to (dddd) only

need help plz

sorry for my english

The code under your fields is not the same, so it's a bit difficult to help you with it, but you can use something like this (this is from D25):

var sDate1 = this.getField('D24').value;
var oDate1 = util.scand("ddd, mmm dd, yy", sDate1.toString());
var fDate1 = oDate1.valueOf();
var fMDay = 1000 * 60 * 60 * 24;
// add 7 days to date
var fDate7 = fDate1 + (1 * fMDay);
// convert millisecond for date + 7 days to date time object
var d = new Date(fDate7);

event.value = "";
if(d.getDay()==0){
	d.setDate(d.getDate()+1);
}else if(d.getDay()==6){
	d.setDate(d.getDate()+2);
} else d.setDate(d.getDate())
if (d.getMonth()==oDate1.getMonth())
	event.value = util.printd("ddd, mmm dd, yy", d);

I would highly recommend you use a doc-level function for this, instead of re-writing the code for each one of the fields. It will work much more consistently (for example, clear the Year field and see what happens) and be much easier to edit...

Edit: Code fixed