Fix: proper sorting resources by age column (#2182)

* - fix: proper sorting for resource age column
- use Date.now() instead of new Date().getTime() (#2141 follow-up)

Signed-off-by: Roman <ixrock@gmail.com>

* fix: proper bar-chart tooltip callback

Signed-off-by: Roman <ixrock@gmail.com>

* fix: sorting in cronjobs, more Date.now() replacements

Signed-off-by: Roman <ixrock@gmail.com>

src/renderer/components/+storage-classes/storage-classes.tsx

@@ -31,7 +31,7 @@ export class StorageClasses extends React.Component<Props> {
         store={storageClassStore} isClusterScoped
         sortingCallbacks={{
           [columnId.name]: (item: StorageClass) => item.getName(),
-          [columnId.age]: (item: StorageClass) => item.metadata.creationTimestamp,
+          [columnId.age]: (item: StorageClass) => item.getTimeDiffFromNow(),
           [columnId.provisioner]: (item: StorageClass) => item.provisioner,
           [columnId.reclaimPolicy]: (item: StorageClass) => item.reclaimPolicy,
         }}