The Biblical Time Line
To understand the Biblical time line we have to look at creation and the time that we are in now.
One Day
In Genesis 2:17 God warned Adam that if he would eat from the Apple tree that God appointed not to eat from, in that day you will surely die. And after Adam and Eve sinned Adam was 970 years old and he died. It was not like that Adam was 970 years old when he sinned and brought death into paradise and he died the same day he ate the apple of the tree of good and evil.
We think he was about 33,5 years old. But that is an assumption because no-one really knows. Explanation why I think this could be follows below.
The point however is that one day for God is a thousand years - and Adam died in that day, and so did Eve. That one day is a thousand years is also confirmed in the new testament in 2 Peter 3:8.
7 days
This is kind of a repetition with the previous article but I'll put it here anyway because this is a very important reference. We know that the number 7 is completion in the Bible, and Christ is expected to come back at the 7th day. Prophet Hosea lived in the 4th divine day, around 7th century BC, and he said in Hosea 6:2:
Come, and let us return to the Lord; For He has torn, but He will heal us; He has stricken, but He will bind us up.
2 After two days He will revive us; On the third day He will raise us up, That we may live in His sight.
So Hosea expects to die in the 4th day, sleeps two days, the 5th and 6th day, and in the 7th day he will be raised in the resurrection.
33,5 Years
In Luke 3:23 we read that Jesus was about thirty years of age when He started His ministry. The from the point on that God said: "You are My beloved Son; in You I am well pleased.”. The ministry of Jesus was from then on to the Cross which spanned 3,5 years. Also one has to be thirty by tradition to become a priest according to the old-testament writings that go back to Moses in Numbers 4:1-6.
Christ's ministry was 3,5 years, that we know. So if Jesus Christ was really born in the year 0 of our Lord, when we started counting the Years from Christ. Then the maximum end date would be like the year 2033,5 when the 6000 years are up and the Day of the Lord comes. If the point is that Jesus would appear exactly after 4000 years, then Adam sinned against God at age 33,5. From that point on the fall began, and the clock was ticking - and the 7 day redemption plan started.
When was Jesus born?
This one is tricky because to pinpoint this you have dig into recorded history documents and the Bible. And it is not in the year zero. That is for sure. The one and foremost argument that Jesus was older than 0 is because of horrid king Herod. Who died in 4 BC. And God called His Son from Egypt where they fled - read Matthew 2. So Jesus would be around 4 years old. This 4 years should be used as a correction - if all of this is right. God reveals He has a great sense of timing throughout Scripture and the New Testament, so I assume that God uses this also in the Biblical time.
The Timeline
The timeline could then look like this:

If Adam sinned when He was 33,5 and the fall of the Universe started and death entered paradise (and was no longer paradise) - then this could be the picture that would show the Biblical timeline. 4000 years later after the fall Christ was born and introduced the new covenant - and the Kingdom is here and now. 2000 years of the Church age follows and completion is at the day of the Lord.
No this does not portrait our calendar because this would suggest the day of the Lord is clearly a fixed point, and it would be, but we do not know what the real time line is. All we can say is that the calendar lags behind the real calendar for probably 4 years.
So it is now 2026, and that would mean it should actually be (+ 4 years) 2030. And that would mean the Day of the Lord could be in 2029 which corresponds to 2033.
7 days from the fall or from creation
The point is, God did not need a 7 day plan for redemption if Adam never sinned. Because it was paradise and he had no knowledge of evil or evil in him. This is why we think the 7 day plan did not start from creation, but from the fall of Adam and Eve bringing death into the world.
Timeline Evaluation
Evaluating this timeline - I feel uneasy because there is more to happen. And if it happens, it has to be really quick like in this year. I am talking about the 7 year covenant of the anti-Christ for Israel. The part of last week (7 years) of Daniel 9:24-27. This is because the anti-Christ is supposed to break the covenant half way. And the day of the Lord comes after that. Either the two events are very close to each other - which I really do hope for - or will still have some more months or years to go.
Other sources say we are 6-4 years off. And that at the moment seems more likely that it is more than 4 years. But as we have seen earlier these years with a certain US president. Thing can change pretty fast.