Putting Date Last Modified on PDF

Question

Is there a way to put the date last modified on a PDF using Javascript? I am trying to organize a folder of PDF maps and the only way I can think of to do it is to print out each map with its file name and date last modified (so we can come back to the folder and delete the duplicates and the really old ones).
The wonderful thread Print File Name with PDF Document has helped me figure out how to put the file name and current date into each pdf as a footer, but when I tried to edit the code to get the date last modified, I get an error.
I will admit that I am a newbie when it comes to Javascript, so any suggestions would be extremely helpful.
My code is as follows:
// SetRemoveFooter
app.addSubMenu({ cName: "Footer",cUser: "Set/Remove Footer", cParent: "File", nPos: 20 });
app.addMenuItem({ cName: "Set Date Time (Filename)", cParent: "Footer", cExec: "SetFooter(1)"});
app.addMenuItem({ cName: " -> Set Date .... centered", cParent: "Footer", cExec: "SetFooter(2)"});
app.addMenuItem({ cName: " -> Set Date .... right", cParent: "Footer", cExec: "SetFooter(3)"});
app.addMenuItem({ cName: "Set Page ", cParent: "Footer", cExec: "SetFooter(4)"});
app.addMenuItem({ cName: "Set Both", cParent: "Footer", cExec: "SetFooter(5)"});
app.addMenuItem({ cName: "-------------------------------", cParent: "Footer",cExec: "{}"});
app.addMenuItem({ cName: "Remove Both", cParent: "Footer", cExec: "RemoveFooter(5)"});
app.addMenuItem({ cName: "Remove Date Time (Filename)", cParent: "Footer", cExec: "RemoveFooter(1)"});
app.addMenuItem({ cName: "Remove Page", cParent: "Footer", cExec: "RemoveFooter(4)"});
//Set/remove Footer
function SetFooter(ARG)
var FileNM = this.documentFileName
var AcDate = document.lastModified
var AcDateFormat = "yyyy/mmm/dd HH:MM"
var Box2Width = 50
for (var p = 0; p < this.numPages; p++)
var aRect = this.getPageBox("Crop",p);
var TotWidth = aRect[2] - aRect[0]
if (ARG<=3 || ARG==5)
{var fd = this.addField("xftDate", "text", p, [30,15, TotWidth-30-30,30]);
fd.value = util.printd(AcDateFormat, AcDate) + " (" + FileNM +")";
fd.textSize=6; fd.readonly = true;
if (ARG==1){ fd.alignment="left" };
if (ARG==2){ fd.alignment="center" };
if (ARG==3){ fd.alignment="right" };
if (ARG==4 || ARG==5)
{var bStart=(TotWidth/2)-(Box2Width/2)
var bEnd=((TotWidth/2)+(Box2Width/2))
var fp = this.addField(String("xftPage"+p+1), "text", p, [bStart,30,bEnd,15]);
fp.value = "Page: " + String(p+1)+ "/" + this.numPages;
fp.textSize=6; fp.readonly = true;
fp.alignment="center";
function RemoveFooter(ARG)
if (ARG<=3 || ARG==5) {var x = this.removeField("xftDate");}
if (ARG==2 || ARG==5) {for (var p = 0; p < this.numPages; p++)
var x = this.removeField(String("xftPage"+p+1)); }
Everything worked wonderfully until I added the line var AcDate = document.lastModified
Is there a simple solution or is this a much more complicated problem?
Thanks!

Answer 1

You need to use:
this.info.ModDate
To get the date the opened PDF was last modified.