I have wondered about this question. I know it may seem simplistic but maybe someone can explain to me how it occurs. Also, maybe there is a relationship between Mathematics and the concept of TIME.
At the very beginning of TIME, before you get to the first second of existence, you had the start of the first second, for example, lets start at 0.00000001> second. Now, since this number could go on and on indefinitely, how would you ever get to the very first second of TIME? Or, is there some law of mathematics that would jump to the 1 second count because TIME requires that the number stop going to infinitum and proceed to the first (1) second? I have always wondered about this.