[whatwg] New File attributes creationDate, modificationDate and size

[Biju]

It would be good if we can also get the same at server side when user
upload a file using form with file controls
ie, like the suggestion at https://bugzilla.mozilla.org/show_bug.cgi?id=549253
(it works even with javascript disabled)

Also remember modificationDate can be a time before creationDate on windows.
This is because modificationDate get copied when you copy a file,
hence it almost shows modificationDate of the actual content.

creationDate on other hand is file creation time on the
folder/directory and when you copy a file to a new directory, it will
be showing the coping time.

PS, for JS option there is mozilla bug 390776