What’s The Difference Between ‘Good Evening, 5 PM And ‘Good Evening, 8 PM’?

Hello, how are you and how has your day been?

Please this baffles me as I wonder why most people greet one another ‘good evening’ when it is dusk (5 pm or 6 pm) and also when the night finally comes (7 pm).
Anybody, to explain that better is there any correlation between those two words?
If yes, why? ‘Cos dusk is still a bit of day
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