I have a java script calulation that works fine on a PC but when the form is on a IPad it does not calculate. Why?

var sDate = this.getField("MDate").value;
if(sDate=="")
event.value="";
else{
var oDate = util.scand("mm/dd/yy", sDate);
oDate.setDate(oDate.getDate() +6);
event.value = util.printd("mm/dd/yy", oDate);

What app is involved?
Many apps on mobile devices cannot handle from fields. They also have very limited JavaScript support. The "uiti" objects is nol fully supported by Adobe Mobile Reader.
http://www.adobe.com/devnet-docs/acrobatetk/tools/Mobile/Enterprise_Guide_ReaderMobile.pdf

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