Improvements after review

app/assets/javascripts/environments/components/environment_item.js.es6

@@ -23,6 +23,7 @@
 
   window.gl = window.gl || {};
   window.gl.environmentsList = window.gl.environmentsList || {};
+  window.gl.environmentsList.timeagoInstance = new timeago(); // eslint-disable-line
 
   gl.environmentsList.EnvironmentItem = Vue.component('environment-item', {
 
@@ -147,10 +148,15 @@
           this.model.last_deployment.deployable;
       },
 
+      /**
+       * Verifies if the date to be shown is present.
+       *
+       * @returns {Boolean|Undefined}
+       */
       canShowDate() {
         return this.model.last_deployment &&
           this.model.last_deployment.deployable &&
-          this.model.last_deployment.deployable.created_at;
+          this.model.last_deployment.deployable !== undefined;
       },
 
       /**
@@ -159,9 +165,9 @@
        * @returns {String}
        */
       createdDate() {
-        const timeagoInstance = new timeago(); // eslint-disable-line
-
-        return timeagoInstance.format(this.model.last_deployment.deployable.created_at);
+        return window.gl.environmentsList.timeagoInstance.format(
+          this.model.last_deployment.deployable.created_at
+        );
       },
 
       /**