JSFiddle - React, Tailwind, and code Playground

HTML

<span class="calculateMinutes" data-timestamp="2014-02-18 15:00:48">

JavaScript

$(document).ready(function() {

    calculateMinutes();
    setInterval(calculateMinutes, 60000);

});

function calculateMinutes() {
    $('.calculateMinutes').each(function () {
        var diff = Math.abs(new Date( $(this).data('timestamp') ) - new Date());
        var minutes = Math.floor((diff/1000)/60);
        $(this).html( minutes + ' min.' );
    });
}