To fix this here is a bit of javascript.
var Start_Date = getComponent("Start_Date").getValue();
var End_Date = getComponent("End_Date").getValue();
// Only update if End Date is not nothing, assume Start_Date is set to today
if (@Text(End_Date)!="")
{
dDatebetween=new Date(Start_Date.getTime());
var dts="";
while (dDatebetween.getTime() <= End_Date.getTime())
{
dts=dts+(@Right("0"+@Text(@Day(dDatebetween)),2)+"/"+@Right("0"+@Text(@Month(dDatebetween)),2)+"/"+@Right(@Text(@Year(dDatebetween)),2))+",";
dDatebetween=new Date(dDatebetween.getTime()+86400000)
}
getComponent("HolDates").setValue(@Left(dts,@Length(dts)-1));
}