How do i change this?

I have another question:

I have this code in field:

var theSubject = this.getField("NAME").value +"'s week " + this.getField("WeekNumber").value + " Payslip from " + this.getField("WeekBegin").value + " To " + this.getField("WeekEnd").value 
this.mailDoc({ 
  bUI: false, 
  cTo: this.getField("Email1").value, 
  cCc: this.getField("Email2").value, 
  cSubject: theSubject, 
  cMsg: "This is " + this.getField("NAME").value +"'s week " + this.getField("WeekNumber").value + " Payslip from " + this.getField("WeekBegin").value + " To " + this.getField("WeekEnd").value

});

Now The WeekBegin and WeekEnd values or in the form of ddmmyy.

Is there a way I can change it to day dd/mm/yy only on this email though (when the field button is pressed).

Basically I just want to convert it for that instances and not let it effect the rest of the pdf.

Just tried it on Acrobat Reader and still doesn't work..

I'm using Adobe Acrobat DC.

I just put 010118. hoping for 1 for week 1

ok when I open your pdf, if I change the date it still shows 6 even after pressing button?

isn't that the code in the Document JavaScript?

This one:

/*** Get the ISO week date week number */

Date.prototype.getWeek = function () {
    // Create a copy of this date object;
    var target  = new Date(this.valueOf());
    //var target  = new Date(this.getField("WeekBegin").value);

    // ISO week date weeks start on Monday;
    // so correct the day number;
    var dayNr   = (this.getDay() + 6) % 7;

    // ISO 8601 states that week 1 is the week;
    // with the first Thursday of that year.;
    // Set the target date to the Thursday in the target week;
    target.setDate(target.getDate() - dayNr + 3);

    // Store the millisecond value of the target date;
    var firstThursday = target.valueOf();

    // Set the target to the first Thursday of the year;
    // First set the target to January first
    target.setMonth(0, 1);
    // Not a Thursday? Correct the date to the next Thursday
    if (target.getDay() != 4) {
        target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7);
    }

    // The weeknumber is the number of weeks between the
    // first Thursday of the year and the Thursday in the target week
    return 1 + Math.ceil((firstThursday - target) / 604800000); // 604800000 = 7 * 24 * 3600 * 1000
}

I put the code in the field. (as a "Refresh" button to be precise that way if I change the dates I can refresh)

nothing happens.

in JS Console I get this:

TypeError: oDate.getWeek is not a function

3:Field:Mouse Up

opps, sorry fixed that.

so its now:

//var oDate = new Date(); // create date object;
var oDate = util.scand("ddmmyy", this.getField("WeekBegin").valueAsString); // create date object using WeekNumber input
var nWeekNumber = oDate.getWeek(); // get the week number for the date object;
//app.alert("For " + util.printd("ddmmyy", oDate) + " it is week " + nWeekNumber, 3, 0);

this.getField("WeekNumber").value = nWeekNumber;

But still no luck?

ok.

so I have this on the field "WeekNumber":

//var oDate = new Date(); // create date object;
var oDate = util.scand("ddmmyy", this.getField("WeekBegin").valueastring); // create date object using WeekNumber input
var nWeekNumber = oDate.getWeek(); // get the week number for the date object;
//app.alert("For " + util.printd("ddmmyy", oDate) + " it is week " + nWeekNumber, 3, 0);

this.getField("WeekNumber").value = nWeekNumber;

And I have this code at document level:

/*** Get the ISO week date week number */

Date.prototype.getWeek = function () {
    // Create a copy of this date object;
    var target  = new Date(this.valueOf());
    //var target  = new Date(this.getField("WeekBegin").value);

    // ISO week date weeks start on Monday;
    // so correct the day number;
    var dayNr   = (this.getDay() + 6) % 7;

    // ISO 8601 states that week 1 is the week;
    // with the first Thursday of that year.;
    // Set the target date to the Thursday in the target week;
    target.setDate(target.getDate() - dayNr + 3);

    // Store the millisecond value of the target date;
    var firstThursday = target.valueOf();

    // Set the target to the first Thursday of the year;
    // First set the target to January first
    target.setMonth(0, 1);
    // Not a Thursday? Correct the date to the next Thursday
    if (target.getDay() != 4) {
        target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7);
    }

    // The weeknumber is the number of weeks between the
    // first Thursday of the year and the Thursday in the target week
    return 1 + Math.ceil((firstThursday - target) / 604800000); // 604800000 = 7 * 24 * 3600 * 1000
}

Is this correct? as I'm still not getting anything?