code for the difference between two date type inputs when clicking a function in javascript

Question

what is the code for finding the difference between two date type inputs when clicking a service button in javascript ? (if admission date and retire date is given and when we click service button the service period should come as alert)

Answer 1

For comparing dates easily i suggest you take a look at using Moment.js

More specifically moment().diff()

From the docs here's how you would compare 2 dates and get the difference in days, i'm assuming you are using jQuery.

$('.service-button').click(function(){
    var subDate = $('.submission-date').val();
    var retireDate = $('.retirement-date').val();
    parseDateDifference(subDate, retireDate);
});

function parseDateDifference(start, end) {
    start = moment(start, 'YYYY-MM-DDD');
    end = moment(end, 'YYYY-MM-DDD');
    var difference = start.diff(end, 'days'); // this now contains you the difference in days between the dates
    alert(difference);
}