JSFiddle - React, Tailwind, and code Playground

HTML

<input id="prfm_dtrequest" type="text" value="03/28/1988">
<br>
<input type="button" id="submitform" value="CLICK"

JavaScript

$(document).ready(function(){
    $("#submitform").click(function(){
	

    function isValidDate(s) {
       var bits = s.split('/');
       var d = new Date(bits[2], bits[0] - 1, bits[1]);
       return d && (d.getMonth() + 1) == bits[0] && d.getDate() == Number(bits[1]);
    }
    var daterequested = $("#prfm_dtrequest").val();
        var dateMMDDYYYRegex = "^[0-9]{2}/[0-9]{2}/[0-9]{4}$";
        if(daterequested.match(dateMMDDYYYRegex) && isValidDate(daterequested)){
            alert('is a valid date: '+daterequested);
        }else{
            alert('is not a valid date: '+daterequested);
        }
    });
});