Did the Big Bang happen at a point? goes through the fact that the Big Bang happened everywhere at the same time. John Rennie's answer explains this as being a consequence of all points in space beings squished into a single point, so technically the Big Bang happened everywhere. But, when we talk about relativity, we also use a fourth dimension of time. So, at the Big Bang all points in space, as well as all points in time should be squished (for lack of better terms) into a single point. So did the Big Bang happen at happen 'every-time'?
Edit: The age of the universe goes into how the true age of the universe can be determined as time flows in different ways for different observers. I am asking whether the Big Bang happened at all points in time together.