To check for valid date format, match the date with −
const dateFormat = /^\d{4}\-\d{2}\-\d{2}$/;Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initialscale=1.0">
<title>Document</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<style>
.check-valid-date {
border: 1px solid red;
}
</style>
</head>
<body>
<input type="date" id="check-valid-date" class="form-control
calender-black" name="dateCalender">
<script>
const dateFormat = /^\d{4}\-\d{2}\-\d{2}$/;
document.getElementById("check-valid-date").addEventListener("change",
checkingForValidDate);
function checkingForValidDate() {
console.log(this.value, dateFormat.test(this.value));
this.classList.toggle('check-valid-date',
dateFormat.test(this.value));
}
</script>
</body>
</html>To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.
Output
This will produce the following output −
Now, I am picking a date. The snapshot is as follows −
Above, the console displays TRUE i.e. valid date format.