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lbreda / Instagram explicit date

// ==UserScript==
// @name         Instagram explicit date
// @namespace    http://lbreda.com/
// @version      1.4
// @description  Show an explicit date string on instagram image pages
// @author       Lorenzo Breda
// @match        https://*.instagram.com/*
// @grant        none
// ==/UserScript==

function modifyTimestring() {
    var monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
        "Jul", "Aug", "Sept", "Oct", "Nov", "Dec"
    ];

    var elems_date = document.getElementsByTagName("time");
    Array.prototype.forEach.call(elems_date, function(item, index) {
        var date = new Date(item.getAttribute('datetime'));
        item.textContent = date.toLocaleString(getLang(), {day: 'numeric', month: 'short', year: 'numeric', hour: 'numeric', minute: '2-digit'});
    });
}

function getLang()
{
 if (navigator.languages !== undefined){
   return navigator.languages[0];
 } else {
   return navigator.language;
 }
}

(function() {
    'use strict';

    modifyTimestring();

    var observer = new window.MutationObserver(function(mutations) {
      if(mutations.length){
        modifyTimestring();
        Array.from(document.getElementsByTagName("time")).forEach(function(element) {
          observer.observe(element, {characterData: true, attributes: true});
        });
      }
    });
    if(document.querySelector('main > section > div > div')){
        observer.observe(document.querySelector('main > section > div > div'), {childList: true});
    }
    observer.observe(document.body, {childList: true});
    Array.from(document.getElementsByTagName("time")).forEach(function(element) {
      observer.observe(element, {characterData: true, attributes: true});
    });
})();