Date Parameter - Text Conversion

Scenario:

I would like to pull all the files that contain "YYYY-MM-DD" in the filename from a SFTP folder as controlled by the user using the Date Interface tool.

I tried connecting the DateTime tool after Update Value to convert the user selected date into text for SFTP filename filtering purposes downstream and this doesn't seem to be the right tool since it displays "(No Suitable Input Fields Available)" in the field selection.

Question:

I'm probably overthinking this but what set of tools should I be using to convert the user's date selection into text?