Time Of The End
When is the time of the end? The answer is a bit relative, but here goes. Depending on when a person exists in time the answer may be different. For Daniel, the time of the end was in the future. Daniel 8:26 says, " it pertains to many days in the future" when talking about the Medes, Persians, and Greeks. Daniel also goes on to talk about this time period as the time of the end in Daniel 8:17-19, and he also called it the final indignation. So we can say the time of the end really started just before the Jesus the Messiah came to earth.
But Jesus also talked about nation rising against nation, earthquakes in various places, and persecution of believers, But ... "these things must take place first, but the end does not follow immediately." Jesus also gave a clue about when the "end" would come. ... "And this gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come." Paul also mentioned in his second letter to Timothy (2 Tim 3:1) that in the last days difficult times will come.
So, I think this identifies at least three different things: the time of the end, Day of the Lord, and the end. Many of the prophets saw their prophecies as a single image far off in the distance. The time of the end for those in the Old Testament included the time of the Messiah's first and second coming. They saw His coming as a single event, but for believers today, we know that His kingdom extends through His second coming. Those in the New Testament saw the time of the end in the future, at the time of Jesus second coming. The disciples asked Jesus when Israel would be restored (Acts 1:6-7), and He implied it would happen in the future.
We must remember that we are in the times of the end. When the Holy Spirit was poured out on the day of Pentecost, that was a fulfillment of Joel chapter 2. "In the last days I will pour out My Spirit on all flesh." We see that the times of the end have covered thousands of years, and still continues. If the disciples thought the end was close, then how much more should we sense it? "The End" is still yet to come, and points to a time in the future when God's ultimate plan is finished. It will happen Once all things have been brought under submission to Christ and He in turn submits that to God.
The third term The Day of the Lord is also in the future and speaks of a time period where Jesus will bring about the destruction of the anti-Christ and the nations that have gathered to destroy Israel. I don't believe this to be a single day, but a period of time. The Day of the Lord may be a week, month, or even a year. There are a couple references to the Day of the Lord in Revelation, which I believe mark the start and end of this time period. Rev 6:17 is the start, and the end will be when Jesus puts an end to the Antichrist in at Armageddon - Rev 16:14