How do I insert a valid timestamp into a CSL style file?

I know this is probably a very silly question so apologies in advance.

I am updating a CSL style file and want to add a timestamp, per:

However, under the cs:update section, it refers to this page:
...which is broken. So, I'm not sure what the proper format is for timestamps - my code keeps failing the validation checker and throwing up errors when I try to import it into Zotero. I'd like to use the "updated" field so I can keep easy track of my edits.

I generally use Atom to edit my CSL files, and I couldn't find a package that inserts a timestamp in the appropriate format. Is there a website that generates this format?

Much thanks!
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