grammar - Understanding "as of", "as at", and "as from"

Joel is mistaken when he says that as of means "up to and including a point of time," although it is often used to mean so.

As of designates the point in time from which something occurs. So as of some point would mean from the date specified onward.

However, his answering of the best way to say each phrase is spot on.

One may use either until or up to to mean the time before which something occurs (remaining ambiguous about whether the date is inclusive or not).

And since is a fine choice.

So far as as from--this is a perfectly good expression in English. It has roughly the same connotation as as of except that it often holds the time before and the time after in contrast.