If there is evidence that someone inspired by God applied it to the prophecies of Daniel and the Revelation then we would have the approval and authority we need. Is there any evidence Jesus, the author and originator of inspiration, did so?

I think using the day-year principle in relation to the 70 Week Prophecy should be enough to know that those two texts and possibly another one substantiates doing this.

So, if it works it must be the right approach?

Jesus associated Daniel’s prophecy with the destruction of Jerusalem in 70 AD. Considering the time aspect of his prophecies it seems evident the day-year rule was applied. Otherwise, the time periods do not add up.

Daniel
8:13 Then I heard one saint speaking, and another saint said unto that certain [saint] which spake, How long [shall be] the vision [concerning] the daily [sacrifice], and the transgression of desolation, to give both the sanctuary and the host to be trodden under foot?
8:14 And he said unto me, Unto two thousand and three hundred days; then shall the sanctuary be cleansed.

Daniel
11:31 And arms shall stand on his part, and they shall pollute the sanctuary of strength, and shall take away the daily [sacrifice], and they shall place the abomination that maketh desolate.

Daniel
12:11 And from the time [that] the daily [sacrifice] shall be taken away, and the abomination that maketh desolate set up, [there shall be] a thousand two hundred and ninety days.

Matthew
24:15 When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand:)
24:16 Then let them which be in Judaea flee into the mountains:

Mark
13:14 But when ye shall see the abomination of desolation, spoken of by Daniel the prophet, standing where it ought not, (let him that readeth understand,) then let them that be in Judaea flee to the mountains:

GC 25
And the Saviour warned His followers: "When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand:) then let them which be in Judea flee into the mountains." Matthew 24:15, 16; Luke 21:20, 21. When the idolatrous standards of the Romans should be set up in the holy ground, which extended some furlongs outside the city walls, then the followers of Christ were to find safety in flight. When the warning sign should be seen, those who would escape must make no delay. {GC 25.4}

Hmm, didn't the Romans use standards for the garison they had in Jerusalem? For the soldiers who crucified Jesus and jailed Paul?

There are two clues that help us discern that the day-year principle should be applied to a prophecy.
First, the time elements in the prophecy are often expressed in unusual ways:
2300 evenings and mornings, or evening-mornings (Dan. 8:14)
A time, two times and half a time (Dan. 7:25, 12:7).

Second, the word "years" is avoided. Either the word "days" (Rev. 11:3, 12:6), or "months" (Rev. 11:2, 13:5), or "weeks" (Dan. 9) is used, or the word "years" is disguised, like in Dan. 7:25, 12:7 mentioned above.

Thanx, Rosangela.

Thomas, did either of those times fulfill the prophecy in Daniel?

Does this following tell us anything about prophecy in general or prophecy specifically?

28"You heard me say, 'I am going away and I am coming back to you.' If you loved me, you would be glad that I am going to the Father, for the Father is greater than I. 29I have told you now before it happens, so that when it does happen you will believe.

Yes, one of the purposes of prophecy is to encourage us to believe when it happens. But in the case of the Ninevites it was to their advantage to believe before it happened. The same thing applies to certain end-time prophecies.

What did you have in mind?

Because it is so that apocalyptic prophecy is one of the things in theology that divides christianity the most. And we know that division between diciples was never God's intention.