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First the JavaScript Date object is not a number and not a date string, so you need to covert it to a number or get the year, month and date from the date object and then adjust the necessary values for 1 day. If you use the 'getTime()' or 'valueOf()' methods to get the date time value from the date object, the value will be in millisecods from the epoch date and not days. You can then add the necessary time interval in milliseconds to get a new date time value and then number can then be converted back to a date object and formatted.

/* Date Printed */ 
// get the current date object
var oCurrentTime = new Date() 
// get the value for the number of milliseconds since the epoch date
var fCurrentTime = oCurrentTime.getTime();
// millisecondsmillisecondsadd 1 day in milliseconds 
var fDay = 24 * 60 * 60 * 1000;
var fNextDay = fCurrentTime + fDay;
// create date object
var oNextDay = new Date(fNextay);

// show results
console.println('Now is: ' + oCurrentTime);
console.pmilliseconds addrintln('Tomarrow is: " + oNextDay);

Or get use the parts of the date object:

/* Date Printed */ 
// get the current date object
var oCurrentTime = new Date() 
// get the part of the date
var fFullYear = oCurrentTime.getFullYear();
var fMonth = oCurrentTime.getMonth();
var fDate = oCurrentTime.getDate();
// create date object
var oNextDay = new Date(fFullYear, fMonth, fDate + 1);

// show results
var sMsg = 'Now is: ' + oCurrentTime;
sMsg +=  '\nTomorrow is: ' + oNextDay;
app.alert(sMsg, 0, 1);

Thanks for the helpful answers.

I revised the script and it is now running without bug. Here it is for info:

/* Date Printed */
// get the current date object
var oCurrentTime = new Date()
// get the part of the date
var fFullYear = oCurrentTime.getFullYear();
var fMonth = oCurrentTime.getMonth();
var fDate = oCurrentTime.getDate();
// create date object
var oNextDay = new Date(fFullYear, fMonth, fDate + 1);

/* Date Printed */

for (var p = 0; p < this.numPages; p++)
{ var fd = this.addField("Date", "text", p, [100,10, 460,40]);

fd.textSize=12; fd.value = "UNCONTROLLED COPY - VALID UNTIL:  " + util.printd("dd mmm yyyy", oNextDay);

fd.allignment = "center"; fd.fillColor = color.black; fd.textColor = color.white; fd.display = display.noView; 

//Print the date

var txtWillPrint = 'var d = this.dirty;\r' 
  + 'var fd = this.getField("Date");\r'

'var fFullYear = oCurrentTime.getFullYear();'

  + 'var oNextDay = new Date(fFullYear, fMonth, fDate + 1);'

  + 'fd.value = "UNCONTROLLED COPY - VALID UNTIL:  " + ' 

  + 'util.printd("dd mmm yyyy", oNextDay);\r' 

  + 'this.dirty = d;'; 
 

this.setAction("WillPrint", txtWillPrint); 
 
}