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<p>Click the button to get a time-based greeting:</p>
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<button onclick="myFunction()">Try it</button>
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<p id="demo"></p>
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<script>
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function myFunction() {
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    var greeting;
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    var time = new Date().getHours();
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    if (time < 10) {
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        greeting = "Good morning";
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    } else if (time < 20) {
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        greeting = "Good day";
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    } else {
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        greeting = "Good evening";
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    }
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document.getElementById("demo").innerHTML = greeting;
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}
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</script>
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