JSFiddle - React, Tailwind, and code Playground

HTML

<span class="datereplace" title="Thu Aug 05 2010 12:36:20 GMT+0000">Aug 05 2010</span><br />
<span class="datereplace" title="Thu Sep 01 2010 12:36:20 GMT+0000">Sep 01 2010</span><br />
<span class="datereplace" title="Thu Sep 28 2010 12:36:20 GMT+0000">Sep 28 2010</span>

JavaScript

$(function() {
    var doReplace = function() {
        var jSpan = $(this);
        var replaceDate = function(i,s) {
            var intCount = i;
            var strUnits = s;
            jSpan.text(intCount + ' ' + strUnits + (i > 1 ? 's' : '') + ' ago');
        };
        var strTime = jSpan.attr('title');
        var intPostingDate = new Date(strTime).getTime();
        var intElapsedTime = new Date().getTime() - intPostingDate;

        var intYears = Math.floor(intElapsedTime / 31536000000);
        if (intYears > 0) { return replaceDate(intYears,'year')};
        var intMonths = Math.floor(intElapsedTime / 2592000000);
        if (intMonths > 0) { return replaceDate(intMonths,'month')};
        var intWeeks = Math.floor(intElapsedTime / 604800000);
        if (intWeeks > 0) { return replaceDate(intWeeks,'week')};
        var intDays = Math.floor(intElapsedTime / 86400000);
        if (intDays > 0) { return replaceDate(intDays,'day')};
        var intHours = Math.floor(intElapsedTime / 3600000);;
        if (intHours > 0) { return replaceDate(intHours,'hour')};
        var intMinutes = Math.floor(intElapsedTime / 60000);
        if (intMinutes > 0) { return replaceDate(intMinutes,'minute')};
    };
    $('span.datereplace').each(doReplace)
});