When using a Date field as part of a document name in Workflow it always converts to text as:

mm/dd/yyyy

This is regardless of my Workflow Server regional language date setting for short date to be:

yyyy/mm/dd

I have also used formatting to specific short date ("d") and when I test the formatting in the token dialog it appears to work but during the workflow it's still mm/dd/yyyy when it's used in a text field.

What am I missing or how do I get yyyy/mm/dd?