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iSkile / UnixTime

// ==UserScript==
// @name         UnixTime
// @version      1.0.0
// @description  Convert unix time
// @copyright    2018, iSkile (https://openuserjs.org/users/iSkile)
// @author       iSkile
// @license      MIT
// @run-at       document-idle
// @include      *://*/*
// ==/UserScript==
/* jshint -W097 */
'use strict';

function textNodesUnder(el) {
    let arr = [];
    let walk = document.createTreeWalker(el, NodeFilter.SHOW_TEXT, {
        acceptNode: function (node) {
            let name, tNode = node;
            while ((tNode = tNode.parentNode) && (name = tNode.nodeName.toLowerCase()) != 'body') {
                if (~['style', 'script', 'texarea', 'pre', 'code'].indexOf(name)) {
                    return NodeFilter.FILTER_REJECT;
                }
            }
            if (node.data.trim() !== '') {
                return NodeFilter.FILTER_ACCEPT;
            }
        }
    }, false);

    while ((el = walk.nextNode())) {
        arr.push(el);
    }

    return arr;
}

function replace(root) {
    if (!root) return;

    let textNodes = textNodesUnder(root);
    for (let node of textNodes) {
        let txt = node.data;

        if(/^\d{8,12}$/.test(txt)) {
            let date = new Date(+txt * 1000);
            let pNode = node.parentNode;
            let timeStr = date.toLocaleString();

            if (pNode.title != timeStr) {
                pNode.title = (pNode.title.trim().length ? pNode.title + "\nUnix time: " : '') + timeStr;
            }
        }
    }
}

let observer = new MutationObserver(function (mutations) {
    mutations.forEach(function (mutation) {
        mutation.addedNodes.forEach(function (addedNode) {
            if (addedNode.nodeType === 1) {
                replace(addedNode);
            }
        });
    });
});

observer.observe(document.documentElement, {
    childList: true,
    subtree: true
});

replace(document.body);