You are right for when Jesus said those words. However, Jesus has ascended to the Father and they are in one accord - equal. in unity and of the same mind. Thus, when Jesus sent His Holy Spirit He revealed more of His plans and purposes, and unfolded more of His timing.
`But concerning the times and seasons, (feasts) brethren, you have no need that I should write, for you yourselves know perfectly that the Day of the LORD so comes as a thief in the night......BUT YOU, brethren, are NOT in darkness that this Day should overtake you as a thief. You are sons of light and sons of the day. We are NOT of the night nor of darkness.` (1 Thess. 5: 1 & 2 & 4 & 5)
Israel and the nations are in darkness and thus the Day of the Lord will overtake them but we, the Body of Christ are told by our Head that we are not in darkness but are of the light.
...exhorting (encouraging and warning) one another and so much the MORE as you SEE the Day (of the LORD) approaching.` (Heb. 10: 25)
We will SEE the Day coming.