Is using "as from" correct English?

Many years ago in my first job, I made the mistake of writing "as from" instead of "as opposed to" in a document. To me it seemed normal usage (I must have learnt it from somewhere) but everyone else claimed it was not correct English.

Were they right?


Solution 1:

They were right:

I am tall as from short

For example, makes no sense whatsoever, I'm afraid.

You might say:

Prices will go up as from 1st January.

But that's the only use I can think of for it. Others may gainsay me.