The ruling on performing the regular voluntary prayer before the obligatory prayer before the time has entered

Is it a condition for the regular voluntary prayer before Zuhr and before Fajr that the time for the prayer has entered?
The regular voluntary prayer that comes before the obligatory prayer must be performed after the time has entered, because it is attached to a prayer that is not valid except after the time has entered. So if a person prays it before the time has entered, thinking that the time has entered, and it turns out that it has not, he should repeat it, and the first one becomes a voluntary prayer, a purely voluntary prayer, not a regular one.