How To Use The Current Time Within If Statements

Getting Help Code Review
#1

Hello mates, I am trying to set greetings according the to the current time, but I am facing the problem of 3 PM and 3 AM. How can I declare it since the hour is a integer?

Code:

    hour, _, _ := time.Now().Clock()

    if hour >= 18 && hour < 3 {
          greetings(Dawn)
}
#2

It could be something like:

 if (hour < 12 && hour <= 3) || (hour > 12 && hour <= 18) {
 		greetings("Dawn")
 }

The first condition check am times and the second one checks pm times

#3

Thank you for the answer. How can I applied this thought to

if hour >= 18 && hour < 6 {
		fmt.Println("\nGood evening.")
}

The statement never occurs because 18 is bigger than 6. I would like signalize that I am referring to 6AM of the another day.

#4

Maybe it is too exhaustive, if so, do not worry about!

I can call evening until 24 and dawn from 0 to 6. My first desire was to call evening from 18 until 3 (next day) and from 3 to 6 call it dawn.

Below is also good.
Code:

if hour >= 18 && hour < 24 {
		fmt.Println("\nGood evening.")

	} else if hour >= 0 && hour < 6 {
		fmt.Println("\nGood dawn.")

	}