when did time begin?
it happened a long time ago. similar to how gravity was "invented," we didn't realize time was happening until we did and that moment is what we refer to as year 0. so in some sense, that's when time began. but that would mean things happened before time began which doesnt make sense, it's all those negative years, or what some people call BC (before clocks). we could say time began a lot longer but its hard to know when since no one realized the time was moving forward.
sometimes i forget that time exists and the moment that was now was actually years beforehand.