Import the framework.

assets/js/_src/timeago.js

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+/*
+ * Caculate the Timeago
+ *
+ * © 2019 Cotes Chung
+ * MIT Licensed
+ */
+
+$(function() {
+
+  function timeago(date, isLastmod) {
+    var now = new Date();
+    var past = new Date(date);
+    var seconds = Math.floor((now - past) / 1000);
+
+    var year = Math.floor(seconds / 31536000);
+    if (year >= 1) {
+      return year + " year" + (year > 1 ? "s" : "") + " ago";
+    }
+
+    var month = Math.floor(seconds / 2592000);
+    if (month >= 1) {
+      return month + " month" + (month > 1 ? "s" : "") + " ago";
+    }
+
+    var week = Math.floor(seconds / 604800);
+    if (week >= 1) {
+      return week + " week" + (week > 1 ? "s" : "") + " ago";
+    }
+
+    var day = Math.floor(seconds / 86400);
+    if (day >= 1) {
+      return day + " day" + (day > 1 ? "s" : "") + " ago";
+    }
+
+    var hour = Math.floor(seconds / 3600);
+    if (hour >= 1) {
+      return hour + " hour" + (hour > 1 ? "s" : "") + " ago";
+    }
+
+    var minute = Math.floor(seconds / 60);
+    if (minute >= 1) {
+      return minute + " minute" + (minute > 1 ? "s" : "") + " ago";
+    }
+
+    return (isLastmod? "just" : "Just") + " now";
+  }
+
+
+  function updateTimeago() {
+    $(".timeago").each(function() {
+      if ($(this).children("i").length > 0) {
+        var isLastmod = $(this).hasClass('lastmod');
+        var node = $(this).children("i");
+        var date = node.text();   /* ISO Dates: 'YYYY-MM-DDTHH:MM:SSZ' */
+        $(this).text(timeago(date, isLastmod));
+        $(this).append(node);
+      }
+    });
+
+    if (vote == 0 && intervalId != undefined) {
+      clearInterval(intervalId);  /* stop interval */
+    }
+    return vote;
+  }
+
+
+  var vote = $(".timeago").length;
+  if (vote == 0) {
+    return;
+  }
+
+  if (updateTimeago() > 0) {      /* run immediately */
+    vote = $(".timeago").length;  /* resume */
+    var intervalId = setInterval(updateTimeago, 60000); /* loop every minutes */
+  }
+
+});