My Javascript if statements using time variables to display different message at set time periods execute a code block when it shouldn't

I am making an if statement that executes using variables based on the Date() function, but the if statement doesn't appear to prevent execution when it should. The code block is intended to reveal one among a set of possible paragraphs when the time is right. Here is my script

<script>
    const D = new Date();
    var m = D.getMinutes();
    var h = D.getHours();

    function showMessage() {
        if ((0 < h <= 5) || ((h == 6) && (m == 0))) {
            document.getElementById("m1").classList.remove("message");
        } else if (((6 == h) && (m != 0)) || (6 < h < 12) || ((h == 12) && (m == 0))) {
            document.getElementById("m2").classList.remove("message");
        } else if (((12 == h) && (m != 0)) || (12 < h < 18) || ((h == 18) && (m == 0))) {
            document.getElementById("m3").classList.remove("message");
        } else {
            document.getElementById("m4").classList.remove("message");
        }
    }
    showMessage();
</script>

Here is the relevant HTML block:

<div id="messagecontainer">
        <p class="message" id="m1">Good morning, you must be an early bird!</p>
        <p class="message" id="m2">Good morning</p>
        <p class="message" id="m3">Good afternoon</p>
        <p class="message" id="m4">Good evening</p>
</div>

And here is the CSS that makes it work:

.message {
    display: none;
}

As you can see, when the "message" class is removed from any paragraph, the paragraph should be revealed. I know this part works but the problem is that, it's always revealing the id="m1" paragraph when it shouldn't be. It should only be excuting from 1am (this is a mistake I just noticed and will fix) to 6pm. Otherwise it should go to as many else if statements as necessary until the time is right and the correct text block executes. For example, it is 3:30pm (15h30m) now and therefore the third block with the "m3" paragraph should be showing. But it's still the "m1".

The only things I can think of are that I somehow botched the syntax on the if statements or otherwise the variable scope isn't allowing me access to the variables within the if statements (I believe they should be global but I could be wrong). Can anyone see the problem?

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