Add current date to PDF documents

Question

This doesn't seem like it should be hard, but I have been unable to find information on how to do it.
I have about 100 PDF files. Somewhere on them, I need to display "Date Printed: dd mmm yyyy", and have the current date displayed.
I don't care whether this is placed at the top of the page, the bottom, or opaque in the background.
I would like to be able to accomplish it using the batch command, but will perform manually if necessary.
I have Acrobat 7 Professional.
Can someone please help me out?

Answer 1

Hi Everyone -<br /><br />Thanks to Dimitri, I was able to do exactly what I wanted to do by using the following code:<br /><br />  // Check for existing field and make sure it's on the first page<br />  var strModName = "DocMessage";<br />    var ofield = this.getField("DocMessage");<br /><br />     // Create Field if it doesn't exist<br /><br />    if(ofield == null)<br />    {<br />       // Field is the width of the page, on the bottom of the page<br />       // and 40 points high (72pts/inch)<br /><br />       for(var i=0;i<this.numPages;i++)<br />       {<br />         var rectField = this.getPageBox("Crop",i);<br />         rectField[1] = rectField[3] + 14; // Set Top<br />         ofield = this.addField({cName: strModName,cFieldType: "text",<br />         nPageNum:i ,oCoords: rectField});<br />         ofield.alignment = "center"; //This is the text alignment of the field<br />         ofield.multiline = true;<br />         ofield.textSize = 8; <br />         ofield.textFont = "Arial";<br />         ofield.display = display.noView; //This is hidden on the page but printable to make viewable change to display.visible or noView<br />        ofield.readonly = true;<br />       }<br />    }<br /><br />    // Add Field to Document Script<br />    var strJS = 'var ofield = this.getField("DocMessage");';<br />    strJS += 'ofield.value = "Intellectual Property of My Company - CONFIDENTIAL. ";';<br />    strJS += 'ofield.value += " Document printed " + util.printd("ddmmmyyyy",new Date()) + ".";';<br />    this.addScript("AddMessage",strJS);<br /><br />However - Now I would like to change the message to say that the document expires on a future date. For example, 14 days from today. I found an example of how to do this on page 266 of the Adobe JS Scripting Guide and have followed it to the letter, but it is not working. Here is the modified code:<br /><br /> // Check for existing field and make sure it's on the first page<br />  var strModName = "DocMessage";<br />    var ofield = this.getField("DocMessage");<br /><br />     // Create Field if it doesn't exist<br /><br />    if(ofield == null)<br />    {<br />       // Field is the width of the page, on the bottom of the page<br />       // and 40 points high (72pts/inch)<br /><br />       for(var i=0;i<this.numPages;i++)<br />       {<br />         var rectField = this.getPageBox("Crop",i);<br />         rectField[1] = rectField[3] + 14; // Set Top<br />         ofield = this.addField({cName: strModName,cFieldType: "text",<br />         nPageNum:i ,oCoords: rectField});<br />         ofield.alignment = "center"; //This is the text alignment of the field<br />         ofield.multiline = true;<br />         ofield.textSize = 8; <br />         ofield.textFont = "Arial";<br />         ofield.display = display.noView; //This is hidden on the page but printable to make viewable change to display.visible or noView<br />        ofield.readonly = true;<br />       }<br />    }<br /><br />    /* Create a date object containing the current date. */<br />    var d1 = new Date();<br />    /* num contains the numeric representation of the current date. */<br />    var num = d1.valueOf();<br />    /* Add fourteen days to todays date, in milliseconds. */<br />    /* 1000 ms/sec, 60 sec/min, 60 min/hour, 24 hours/day, 14 days */<br />    num += 1000 * 60 * 60 * 24 * 14;<br />    /* Create our new date, 14 days ahead of the current date. */<br />    var d2 = new Date(num);<br />    // Add Field to Document Script<br />    var strJS = 'var ofield = this.getField("DocMessage");';<br />    strJS += 'ofield.value = "Intellectual Property of My Company - CONFIDENTIAL. ";';<br />    strJS += 'ofield.value += " Document expires on " + util.printd("ddmmmyyyy", d2) + ".";';<br />    this.addScript("AddMessage",strJS);<br /><br />The resulting output is simply: "Intellectual Property of My Company - CONFIDENTIAL." The part of the message regarding the expiration date doesn't even show up.<br /><br />Anyone have any suggestions?