Ajout de la durée d'emploi en javascript

lib/main.js

@@ -1 +1,22 @@
-"use strict";
+"use strict";
+
+function datediff(first, second) {
+  // Take the difference between the dates and divide by milliseconds per day.
+  // Round to nearest whole number to deal with DST.
+  return Math.round((second - first) / (1000 * 60 * 60 * 24));
+}
+
+function displayLenghtTimeCurrentEmployer() {
+  // date début
+  var firstDay = new Date(2016, 6, 1);
+  var dateCurrentEmployeur = document.getElementById("dateCurrentEmployeur");
+  var today = Date();
+  var numberOfDays = datediff(new Date(firstDay), new Date(today));
+  var numberOfYearsTmp = numberOfDays / 365;
+  var numberOfYears = Math.trunc(numberOfYearsTmp);
+  var numberOfMonths = Math.trunc(numberOfYearsTmp.toString().split(".")[1] / 1000000000000000 * 12);
+  var numberOfMonthsText = numberOfMonths != 0 ? " et " + numberOfMonths + " mois" : "";
+  dateCurrentEmployeur.innerHTML = "Depuis " + numberOfYears + " ans" + numberOfMonthsText + ".";
+}
+
+displayLenghtTimeCurrentEmployer();