Get date a custom date field was updated

Hi there,

I have a custom field which is a date, I want to grab the date that field was last updated (regardless of the value of the custom field).

I am attempting to follow the guidance on this page:

Last date when custom field changed

However, I am unable to get it to return any results. I have test issues that I have confirmed do have multiple updates to the value in their history.

How should the custom javascript be modified for this specific use?

I appreciate any help offered,