When we look to those of the former age we discover that the day-year language of prophecy was well understood:
Job 8:8 For enquire, I pray thee, of the former age, and prepare thyself to the search of their fathers: 9 (For we [are but of] yesterday, and know nothing, because our days upon earth [are] a shadow:)
Isaac Newton - "She is nourished by the merchants of the earth, three times or years and an half, or 42 months, or 1260 days: and in these Prophecies days are put for years." - Observations Upon the Prophecies of Daniel, and the Apocalypse of St.a John - Chapter 3
Also Jamison, Faucett & Brown commentary - "..... in the wilderness 'a thousand two hundred and threescore days.' In the wider sense, we may either adopt the year-day theory of 1260 years..."
Quoting from "The False Prophet": "In 1569, the great Anabaptist theologian, Thieleman van Braght, wrote the following in Martyrs Mirror, pages 21-24: 'a thousand two hundred and threescore days, which reckoned according to prophetic language means as many years' let it be reckoned as it may, say we, as a very long period of time.'
Two hundred years later, Matthew Henry, in his 'Commentary of the Whole Bible', came to the same conclusion (Vol VI, page 1157 column 1, para. 2): "...if the beginning of that interval could be ascertained, this number of prophetic days, taking a day for a year, would give us a prospect of when the end might be."
The source of this language can be found in these key verses:
Ezekiel 4:5 For I have laid upon thee the years of their iniquity, according to the number of the days, three hundred and ninety days: so shalt thou bear the iniquity of the house of Israel.
Ezekiel 4:6 And when thou hast accomplished them, lie again on thy right side, and thou shalt bear the iniquity of the house of Judah forty days: I have appointed thee each day for a year.
Numbers 14:34 After the number of the days in which ye searched the land, [even] forty days, each day for a year, shall ye bear your iniquities, [even] forty years, and ye shall know my breach of promise.
Genesis 29:27 Fulfil her week, and we will give thee this also for the service which thou shalt serve with me yet seven other years.
Additionally Exodus alludes to a week of days as years:
Exodus 23:10 And six years thou shalt sow thy land, and shalt gather in the fruits thereof:
Exodus 23:11 But the seventh [year] thou shalt let it rest and lie still; that the poor of thy people may eat: and what they leave the beasts of the field shall eat. In like manner thou shalt deal with thy vineyard, [and] with thy oliveyard.
Other examples of those who understood this language include:
Augustine (AD 430)
Nahawendi (Jewish) (AD 8-9th century)
Jehoram (AD 10th century)
Abraham bar Hiyya (Jewish) (AD 1136)
Arnold of Villanova AD (1292)
Tichonius (AD 380)
Joachim of Floris (AD 1202)
John Wycliffe (AD c.1379)
Nicholas of Cusa (AD c.1452)
Martin Luther (AD 1522)
Phillip Melanchthon (AD 1543)
Johan Funck (AD 1558)
James I of England (AD 1600)
Sir Isaac Newton (AD 1727)
It is important to note that the studies in this website discuss FULFILLED prophecy.
"The folly of interpreters has been to foretell times and things by this prophecy [Revelation], as if God designed to make them prophets. By this rashness they have not only exposed themselves, but brought the prophecy also into contempt. The design of God was much otherwise. He gave this and the prophecies of the Old Testament, not to gratify men's curiosities by enabling them to foreknow things, but that after they were fulfilled they might be interpreted by the event, and his own providence, not the interpreters', be then manifested thereby to the world. For the event of things predicted many ages before will then be a convincing argument that the world is governed by Providence." - Sir Isaac Newton
We should consider the warning that Jesus gave to the Pharisees, and never allow our doctrine to trump the truth of God's Holy Word:
Mark 7:13 Making the word of God of none effect through your tradition, which ye have delivered: and many such like things do ye.