You're thinking about this incorrectly. Like the person who says that distance of an arrow shot as a function of time d(t) such that each successive value of t the distance halves means that the arrow will never cover the entire distance. This is absurd [in life] because you can fire a bow and the arrow will cover that distance in some finite (and short) period of time.
Yes, good old Zeno’s paradox. That was not what my question relates to, however.
Without a temporal past, how can any moment be begun?