FB Timestamps+PostID

// ==UserScript==
// @name     FB: Full Timestamps 2018
// @match    https://www.facebook.com/*
// @match    https://*.facebook.com/*
// @match    http://www.facebook.com/*
// @match    http://*.facebook.com/*
// @run-at   document-start
// @grant    GM_addStyle
// @author   wOxxOm & JZersche
// @require  https://greasyfork.org/scripts/12228/code/setMutationHandler.js
// @require  http://momentjs.com/downloads/moment.min.js
// @version 3.1
// @namespace https://greasyfork.org/users/95175
// @description Shows full timestamps on Facebook posts
// @downloadURL none
// ==/UserScript==

var options = { weekday: 'long', year: 'numeric', month: 'numeric', day: '2-digit' };


GM_addStyle(
    '.full-timestamp { opacity: 0.85; color: #09f; }' +
    '.full-timestamp:hover { opacity: 1.0; }' +
    '.full-timestamp:before { content: ""; }' +
    '.full-timestamp:after  { content: ""; }' +
    '.timestampContent {display: none; }'
);

// process the already loaded portion of the page if any
expandDates(document.querySelectorAll('abbr[data-utime]'));

// process the stuff added from now on
setMutationHandler(document, 'abbr[data-utime]', expandDates);
setMutationHandler(document, '._5pcq', expandPostIDs);

function expandDates(nodes) {
    for ( var i = 0, abbr; (abbr = nodes[i++]); )
{
        if (abbr.querySelector('.full-timestamp')) {
            // already processed
            continue;
        }

        abbr.insertAdjacentHTML('beforeend', '<span class="full-timestamp">' +
        ' on ' + abbr.title
                                .replace(/am|pm/,'')

                                .replace(/0\d/, number => number[1]).replace(218,2018) +

                                (moment(new Date(abbr.dataset.utime * 1000)).format(':ss') + abbr.title.match('pm|am') + '' ));
    }
}

function expandPostIDs(nodes) {
    for ( var i = 0; i < nodes.length; i++ )
    {
        var element = nodes[i];
        if(element.innerHTML.includes('Post ID') === false && element.className === '_5pcq')
        {
         element.insertAdjacentHTML('beforeend', '<br> ' +  element.href.replace('/groups/','Group: ').replace('/permalink/','<br>Post ID: ').slice(24,100).replace('/',''));
        }
    }
}