Experience calculator : create a html file and put this code and run

exp.html

<input type="text" id="from" placeholder="Starting date dd-mm-yyyy">
<input type="text" id="to" placeholder="Ending date dd-mm-yyyy">
<button onclick="calculate()">Calculate</button>

<script>
    function calculate(){
        var from = document.getElementById('from').value;
        var to = document.getElementById('to').value;
        from = from.split('-');
        var from_day = parseInt(from[0]);
        var from_month = parseInt(from[1]);
        var from_year = parseInt(from[2]);

        to = to.split('-');
        var to_day = parseInt(to[0]);
        var to_month = parseInt(to[1]);
        var to_year = parseInt(to[2]);


        alert("Difference is " + Math.floor((g(to_year,to_month,to_day) - g(from_year,from_month,from_day))/365) +" years, "+Math.floor((g(to_year,to_month,to_day) - g(from_year,from_month,from_day))/30) + " months and " + Math.floor((g(to_year,to_month,to_day) - g(from_year,from_month,from_day)) % 30) + " " +" days")
    }

    function g(y,m,d){
        m = (m + 9) % 12;
        y = y - Math.floor(m/10);
        return 365*y + Math.floor(y/4) - Math.floor(y/100) + Math.floor(y/400) + Math.floor((m*306 + 5)/10) + ( d - 1 )
    }

</script>