Found a workable solution, you can also peak behind to see the code.
Decided to start over from basics and follow this:
https://www.openhab.org/docs/tutorial/rules_advanced.html
Was going to Administration → Settings → Add-Ons-> Automation to install this:
https://www.openhab.org/addons/automation/jsscripting/
However discovered a DateTime Block library
Which allowed me to do this:

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