More Dates in Designer

Hi all,

I have a simple Designer ES (8.2) form that I'm trying to make work but I cannot make it calculate. Such a simple problem, I got it to work on an Acroform but I can't get it to work in Designer.

I need to determine how long a rehired employee was gone. Using Thom's excellent [url=http://www.acrobatusers.com/tutorials/2006/date_time_part1]Date & Time tutorials[/url], I was able to craft the following code when given a Termination Date and the Rehire Date:

var strStart = this.getField("RehireDate").value;
var strEnd = this.getField("TermDate").value;

if(strStart.length && strEnd.length)
{
var dateStart = util.scand("mm/dd/yyyy",strStart);
var dateEnd = util.scand("mm/dd/yyyy",strEnd);
var diff = dateStart.getTime() - dateEnd.getTime();
var oneDay = 24 * 60 * 60 * 1000;
var days = Math.floor(diff/oneDay);
event.value = days;
}
else
event.value = 0;

But I am having difficulty translating this into something Designer recognizes. Here's where I'm at so far:

var strStart = EmpInfoGroup.dtmRehireDate1.rawValue;
var strEnd = EmpInfoGroup.dtmTermDate1.rawValue;

if (dtmStart.length && dtmEnd.length)
{
var dateStart = util.scand("mm/dd/yyyy",strStart);
var dateEnd = util.scand("mm/dd/yyyy",strEnd);
var diff = dateStart.getTime() - dateEnd.getTime();
var oneDay = 24 * 60 * 60 * 1000;
var days = Math.floor(diff/oneDay);
event.value = days;
}
else
event.value = 0;

Any help would be greatly appreciated.