What's the opposite expression of 'A year from today'?

What's the opposite expression of 'A year from today'?
I want to say ' I want to go back one a year ago', but it sounds very awkward to me.
How can I say this in a natural way?

Thanks a lot for your help :)
Hyunwook

[I'd say "I want to go back a year." Example: "I want to go back a year, to what happened a year ago." I might use "I want to go back one year" with 'one' instead of 'a', but it sounds slightly more precise, or less natural if you don't want the extra precision.]