How to create an alert for events occurring out of office hours

How to create an alert for events occurring out of office hours

I want to create an alert that is triggered when an event specifically occurs out-of-hours. Struggling to find criteria that will define this. Can see a "Logon Hours" value but have no indication whether this will serve the purpose or what the possible values are. Has anyone done something similar that will point me in the right direction.

Is there a published document showing the definitions and values for all the possible criteria options.
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