Acts 1:6-7

So when they were assembled, they asked Him, Lord, is this the time when You will reestablish the kingdom and restore it to Israel? He said to them, It is not for you to become acquainted with and know what time brings [the things and events of time and their definite periods] or fixed years and seasons (their critical niche in time), which the Father has appointed (fixed and reserved) by His own choice and authority and personal power.