Hippolytus of Rome
Counting the time from the creation of the world and of Adam, we shall easily find what is sought. The first coming of our Lord in the flesh, which took place in Bethlehem, occurred eight days before the Kalends of January, on Wednesday, in the forty-second year of Augustus's reign.
From Adam it was in the five thousand five hundredth year. He suffered in His thirty-third year, eight days before the Kalends of April, on Friday, in the eighteenth year of Tiberius Caesar.
This was under the consuls Rufus and Rubellio, and Gaius Caesar, who was consul for the fourth time, and Gaius Cestius Saturninus.
Therefore, in order that the holy day of rest may come, on which God rested from all His works that He had made (cf. Gen 2:2), these six thousand years must be fulfilled.
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For the Sabbath is the image and likeness of that kingdom of the saints which is to be revealed. Then, as John says in the Apocalypse, they will reign with Christ (cf. 2 Tim 2:12) after He comes from heaven.
Indeed, "the day of the Lord is as a thousand years" (2 Pet 3:8). Therefore, if God created all things in six days, six thousand years must also be fulfilled. Yet they have not yet been fulfilled.
John says: "Five have fallen, and one is," that is, the sixth. "The other has not yet come." By this other he understands the seventh, in which there will be rest.