Display license start date without special format

The subscription details card and the license history entries
now display the `Started` and `Valid From` dates using the
same format (ISO 8601 date) that we get from the GraphQL
response.

Changelog: fixed
EE: true

ee/app/assets/javascripts/pages/admin/cloud_licenses/components/subscription_details_card.vue

@@ -2,18 +2,15 @@
 import { GlCard } from '@gitlab/ui';
 import { identity } from 'lodash';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
-import { formatDate, getTimeago } from '~/lib/utils/datetime_utility';
+import { getTimeago } from '~/lib/utils/datetime_utility';
 import { capitalizeFirstCharacter } from '~/lib/utils/text_utility';
 import SubscriptionDetailsTable from './subscription_details_table.vue';
 
-const humanReadableDate = (value) => (value ? formatDate(value, 'd mmmm yyyy') : '');
-
 const subscriptionDetailsFormatRules = {
   id: getIdFromGraphQLId,
   expiresAt: getTimeago().format,
   lastSync: getTimeago().format,
   plan: capitalizeFirstCharacter,
-  startsAt: humanReadableDate,
 };
 
 export default {

ee/spec/frontend/admin/cloud_licenses/components/subscription_details_card_spec.js

@@ -73,7 +73,7 @@ describe('Subscription Details Card', () => {
         },
         {
           detail: 'startsAt',
-          value: '11 March 2021',
+          value: '2021-03-11',
         },
       ]);
     });