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How can I get the last day and the next day in javascript ?

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Show ResultJAVASCRIPT

<!DOCTYPE html>
<html>
<head>

<script>

function test() {

var today = new Date();
var yesterday = new Date(today.getTime() + (-24 * 60 * 60 * 1000));
var tomorrow = new Date(today.getTime() + (24 * 60 * 60 * 1000));

past = yesterday;
future = tomorrow;

var a = past.getDay();
var b = future.getDay();

switch (a) {
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
case 2:
day = "Tuesday";
break;
case 3:
day = "Wednesday";
break;
case 4:
day = "Thursday";
break;
case 5:
day = "Friday";
break;
case 6:
day = "Saturday";
}

alert("yesterday was " + day);

switch (b) {
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
case 2:
day = "Tuesday";
break;
case 3:
day = "Wednesday";
break;
case 4:
day = "Thursday";
break;
case 5:
day = "Friday";
break;
case 6:
day = "Saturday";
}

alert("tomorrow is " + day);

}

</script>

</head>
<body>

<button onclick="test()">click</button>

</body>
</html>