I'd like to be able to sort by a timestamp, e.g. kubectl get rs --sort-by=metadata.creationTimestamp
but that fails with an exception:

F0415 11:01:43.681401   30235 sorting_printer.go:182] Field {.metadata.creationTimestamp}
in ... is an unsortable type: struct, err: unsortable type: struct

I appreciate that the root of the problem is probably outside of kubernetes, yet I hope you'd agree that sorting by a timestamp is very useful functionality.