Determining the length of a year based on user-provided date input in a textbox

How can I show the duration in years? After a date is entered into a text box, the total number of years (duration) should be displayed in the next field. For example, if a user enters 09/11/2015, it should display as 0.5 as the value by comparing it to today's date. I am currently using the following script:

function calculateDuration()
{
   obj = document.getElementById("Date");
        if (obj != null) {
            if (obj.value != "") {
                var year = obj.value.split("/")[2];
                var today = new Date();
                if (year > today.getFullYear()) {
                    alert("Invalid Year");
                    document.getElementById("Date").value = "";
                    document.getElementById("year").value = "";
                }
                else {
               
         document .getElementById("year").value = today.getFullYear() - year;
               } }
            }
}

`

javascriptasp.net

Answer №1

function calculateDays(){
var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
var firstDate = new Date(2016,04,12);
var secondDate = new Date(2016,04,25);

var diffDays = Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay)));

alert(diffDays+" Day(s)");
//document.getElementById('test').innerHTML=diffDays;

}
<button onClick="calculateDays()">
Click Here
</button>

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