You are right.You could say that.Also you could say :
i ate at one Oc'lock yeasterday.
I was eating at one yeasterday.
some usages are wide.and you know that it is not just like math; when you say one plus one is two.
Your sentence, as long as concerned to grammer is right but as we judge it on the parameters of its sense then it is wrong. "everyday" makes the work done in the sentence habitual. So, i would recommend: