date field patterns and barcodes

I have a date field that is mapped to a barcode.  the date field has a pattern > Data of date {YYYYMMDD} because the target system requires it without the dashes.

However when the barcode generates it always encodes YYYY-MM-DD (ie. WITH THE DASHES). 

If i do a xfa.host.messageBox (this.rawValue) it always displays the YYYY-MM-DD. 

If I call the this.formattedValue it does return YYYYMMDD.

To fix this i created a hidden field which i wrote to on the exit of the datefield and mapped this hidden field to the barcode.

     hiddenField.rawValue = this.formattedValue

Is there a better way to do this without the hidden fields?  I ask since i have a bunch of date fields..

How/where do i change the pre-generated barcode code to grab the formattedValue instead of the rawValue if its a datetimefield?