Times or seasons (chronous ē kairous). “Periods” and “points” of time sometimes and probably so here, but such a distinction is not always maintained. See note on Act 17:26 for kairous in the same sense as chronous for long periods of time. But here some distinction seems to be called for. It is curious how eager people have always been to fix definite dates about the second coming of Christ as the apostles were about the political Messianic kingdom which they were expecting.
Hath set (etheto). Second aorist middle indicative, emphasizing the sovereignty of the Father in keeping all such matters to himself, a gentle hint to people today about the limits of curiosity. Note also “his own” (idiāi) “authority” (exousiāi).