How could I use a date formatted as 'yyyymmdd' to calculate an age?

Here is some code I found on another question, and like I said, it works with the dates having the slashes, but throws errors when they don't even with the format as 'yyyymmdd'

function GetField(cName) {

var oField = this.getField(cName);

if (oField == null) {

app.alert("Field " + cName + " not found.\nPlease check spelling and capitalization of the field name.", 0, 1);

}

return oField;

}

function Scand(cFormat, cDate) {

var oDate = util.scand(cFormat, cDate);

if(oDate ==  null) {

app.alert("Error converting " + cDate + " with format " + cFormat + "\nConversion failed.", 0, 1)

}

return oDate;

}

var cBirthDate = "App.DOB";

var cCutoffDate = "Form.Date";

var cDateFormat = "yyyymmdd";

event.value = "";

var cDob = getField(cBirthDate).value;

var cCutoff = getField(cCutoffDate).value;

if (cDob != "" && cCutoff != "") {

var oDob = Scand(cDateFormat, cDob);

var oCutoff = Scand(cDateFormat, cCutoff);

event.value = oCutoff.getFullYear() - oDob.getFullYear();

event.value = event.value - Number(oCutoff.getMonth() < oDob.getMonth());

event.value -= Number((oCutoff.getMonth() == oDob.getMonth())) && Number(oCutoff.getDate() < oDob.getDate());

}