Let me guess. The full number is 0.000262085032032615?
Since variables are loosely typed in AAE V11, (not so in A2019), it doesn’t know you want a String. It’s doing math. 9/17/2020 is 9 divided by 17 divided by 2020.
You can fix this by wrapping your date variable in quotes (or anything that doesn’t register as a number or math operator) to force it to become a string & then removing the quotes (or other non-number or math operator) in a String Before-After operation.
Here’s the String Before-After: