2.3 capstone project level 2

https://learninghub.kx.com/forums/topic/2-3-capstone-project-level-2

Hi, I'm trying to solve the 2.3 section of capstone project - level 2 

When I do 

meta optRef , I see that the expiry date is D instead of d. I think this is the problem which is causing the failure of the running test.

I tried converting it to date format but it's not working. 

I tried with 

optRef: update expiry: d$expiry from optRef

I also tried with:

optRef: update expiry: `date$expiry from optRef


but in both cases I don't see any changes.