Wire new date formats to --date=<format> parser.
Wire new date formats to --date=<format> parser.

Now we can use all internally supported date formats with

	git log --date=<format>

syntax.  Earlier, we only allowed relative/local/default.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git