Student or Learner
which is correct??
In Dr. Smith's report, he said John had headaches as at the time of writing.
In Dr. Smith's report on John, he said John had headaches as of the time of writing.
Here, both sound more or less correct in that we do hear them, but as Ray says, they don't sound very good.
They're not ambiguous in this case. But when you have a sentence like "We've raised $300 as of last Saturday", it can mean "up until last Saturday" or "since last Saturday".
"As at" is not so bad as "as of", but I still can't see the need for it.
There may be some regional difference, then, Ray.
If someone said "We've raised $300 as of last Saturday," for me, that would only mean that "The last time I checked was Saturday, and on that day, we had raised $300, but it may be more than that now."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
"As of our last conversation, your work hasn't improved at all!"
Preposition: as of
- From that time
as of, beginning on; on and after; from: This price is effective as of June 23.
and more ...