The day-year principle, year-day principle or year-for-a-day principle is a method of interpretation of Bible prophecy in which the word day in prophecy is considered to be symbolic of a year of actual time. In Biblical eschatology a 'Prophetic Year' is a time different than from an ordinary year, as it was referred to as a 'day' when it actually was a year. The three primary precedents in Scripture:
1. Numbers 14:34. The Israelites will wander for 40 years in the wilderness, one year for every day spent by the spies in Canaan.
2. Ezekiel 4:5-6. The prophet Ezekiel is commanded to lie on his left side for 390 days, followed by his right side for 40 days, to symbolize the equivalent number of years of punishment on Israel and Judah respectively.
3. Daniel 9:24-27. This is known as the Prophecy of Seventy Weeks. The majority of scholars do understand the passage to refer to 70 "sevens" or "septets" of years—that is, a total of 490 years.
We also see its use in the 360-year period of "time" composed of 360-day "years". So why is it not a year equal to 365 days as we hold today? Well in ancient times the year was held to be at 360 days. The fact that the prophets understood a year as 360 days is well attested, and can be seen in the prophecies of Daniel and Revelation as seen in the use of "time, times and half a time" (i.e. 1+2+0.5=3.5), "1,260 days" and "42 months". These references represent a period of 1260 years (based on the 360 day Jewish year multiplied by 3.5). Divide 1,260 days by 42 months and you will get a 30-day month, as 12 months of 30 days equals 360-days in a year
These time periods occur eight times in scripture:
Daniel 7:25, "time, times and a half".
Daniel 9:27, "half one set of seven".
Daniel 12:7, "time, times and a half".
Revelation 11:2, "42 months".
Revelation 11:3, "1260 days".
Revelation 12:6, "1260 days".
Revelation 12:14, "time, times and a half".
Revelation 13:5, "42 months".
We can see how it relates in the following Bible verses referring to the period translated, "time".
And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time. Daniel 7:25
And I heard the man clothed in linen, which was upon the waters of the river, when he held up his right hand and his left hand unto heaven, and sware by him that liveth for ever that it shall be for a time, times, and a half; and when he shall have accomplished to scatter the power of the holy people, all these things shall be finished. Daniel 12:7
And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent. Revelation 12:14
So its clear, the "time, times and half a time" (i.e. 1+2+0.5=3.5), "1,260 days" and "42 months" mentioned in Daniel and Revelation represent a period of 1260 years (based on the 360 day Jewish year multiplied by 3.5).
The fact that a day can signify a year is of crucial importance in the study of Bible Prophecy. This view was recognized by the Jews as seen in Daniel 9:24-27, and as seen in Jesus' use of the day-year principle in Luke 13 verses 31-33, and in the early church. The Reformers and many others, Martin Luther, John Calvin, Ulrich Zwingli, John Wycliffe, John Knox, William Tyndale, Phillip Melanchthon, Sir Isaac Newton, Jan Huss, John Foxe, John Wesley, Jonathan Edwards, George Whitefield, Charles Finney, C. H. Spurgeon, Matthew Henry, Adam Clarke, Albert Barnes, E. B. Elliot, H. Grattan Guinness, and Bishop Thomas Newton understood this to name just a few.
1. Numbers 14:34. The Israelites will wander for 40 years in the wilderness, one year for every day spent by the spies in Canaan.
2. Ezekiel 4:5-6. The prophet Ezekiel is commanded to lie on his left side for 390 days, followed by his right side for 40 days, to symbolize the equivalent number of years of punishment on Israel and Judah respectively.
3. Daniel 9:24-27. This is known as the Prophecy of Seventy Weeks. The majority of scholars do understand the passage to refer to 70 "sevens" or "septets" of years—that is, a total of 490 years.
We also see its use in the 360-year period of "time" composed of 360-day "years". So why is it not a year equal to 365 days as we hold today? Well in ancient times the year was held to be at 360 days. The fact that the prophets understood a year as 360 days is well attested, and can be seen in the prophecies of Daniel and Revelation as seen in the use of "time, times and half a time" (i.e. 1+2+0.5=3.5), "1,260 days" and "42 months". These references represent a period of 1260 years (based on the 360 day Jewish year multiplied by 3.5). Divide 1,260 days by 42 months and you will get a 30-day month, as 12 months of 30 days equals 360-days in a year
These time periods occur eight times in scripture:
Daniel 7:25, "time, times and a half".
Daniel 9:27, "half one set of seven".
Daniel 12:7, "time, times and a half".
Revelation 11:2, "42 months".
Revelation 11:3, "1260 days".
Revelation 12:6, "1260 days".
Revelation 12:14, "time, times and a half".
Revelation 13:5, "42 months".
We can see how it relates in the following Bible verses referring to the period translated, "time".
And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time. Daniel 7:25
And I heard the man clothed in linen, which was upon the waters of the river, when he held up his right hand and his left hand unto heaven, and sware by him that liveth for ever that it shall be for a time, times, and a half; and when he shall have accomplished to scatter the power of the holy people, all these things shall be finished. Daniel 12:7
And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent. Revelation 12:14
So its clear, the "time, times and half a time" (i.e. 1+2+0.5=3.5), "1,260 days" and "42 months" mentioned in Daniel and Revelation represent a period of 1260 years (based on the 360 day Jewish year multiplied by 3.5).
The fact that a day can signify a year is of crucial importance in the study of Bible Prophecy. This view was recognized by the Jews as seen in Daniel 9:24-27, and as seen in Jesus' use of the day-year principle in Luke 13 verses 31-33, and in the early church. The Reformers and many others, Martin Luther, John Calvin, Ulrich Zwingli, John Wycliffe, John Knox, William Tyndale, Phillip Melanchthon, Sir Isaac Newton, Jan Huss, John Foxe, John Wesley, Jonathan Edwards, George Whitefield, Charles Finney, C. H. Spurgeon, Matthew Henry, Adam Clarke, Albert Barnes, E. B. Elliot, H. Grattan Guinness, and Bishop Thomas Newton understood this to name just a few.