yes, HFS can do it, but SOMETHING must tell it the time.
being HFS on the server-side, and the flash on client-side, it must be done through the net.
the flash can easily communicate the time, it's just that it need to be programmed to do so.
you can then create a hidden folder makexml with a diff template that creates the file {.save.}, and eventually call batchsplit {.exec.}