If you were observing a white hole from Earth, it would not appear as the past. In fact, white holes are purely theoretical constructs within the framework of general relativity, and there is currently no observational evidence for their existence.
White holes are often described as "time-reversed" versions of black holes. While black holes are regions of spacetime from which nothing, including light, can escape, white holes are hypothetical objects from which nothing can enter. In other words, while black holes are characterized by an event horizon from which matter and energy can only move inward, white holes would be characterized by an event horizon from which matter and energy can only move outward.
If white holes were real and observable, the light and other forms of radiation emitted from them would travel away from the white hole, not towards it. So, if you were observing a white hole from Earth, you would see the light and radiation coming from the white hole and moving away from it, just like observing any other source of light in the universe.
The concept of white holes and their relationship to time is still highly speculative, and their behavior, if they exist, is not well understood. It is an active area of research and exploration in theoretical physics, but at present, we do not have the empirical evidence or a comprehensive theoretical framework to fully explain or observe the properties of white holes.