How to enable/disable a hyperlink based on the clock

I want to provide a link to join a regular Zoom webinar but
enable/disable it just like a garden sprinkler.

Enable at noon on Friday, disable fifteen minutes later. Repeat for next
Friday.

It feels like I need some sort of push. I'm not a js person.

Perhaps I should be looking at htmx?

Any hints?

Thanks

mike

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