Fix list sort by age (#276)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

dashboard/client/components/+user-management-service-accounts/service-accounts.tsx

@@ -34,7 +34,7 @@ export class ServiceAccounts extends React.Component<Props> {
           sortingCallbacks={{
             [sortBy.name]: (account: ServiceAccount) => account.getName(),
             [sortBy.namespace]: (account: ServiceAccount) => account.getNs(),
-            [sortBy.age]: (account: ServiceAccount) => account.getAge(false),
+            [sortBy.age]: (account: ServiceAccount) => account.metadata.creationTimestamp,
           }}
           searchFilters={[
             (account: ServiceAccount) => account.getSearchFields(),
@@ -78,4 +78,4 @@ export function ServiceAccountMenu(props: KubeObjectMenuProps<ServiceAccount>) {
 
 apiManager.registerViews(serviceAccountsApi, {
   Menu: ServiceAccountMenu,
-})
+})