C'mon, just tell me.
There were a few decrees. The one most definitive was in 457BC. Easily researched.
The Diagram shows that the 2,300 years of the Daniel 8: 9-14 started in 457 BC however if we consider the details in Daniel 8 it tells us the following: -
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Daniel 8: 8-23: - 8 Therefore the male goat grew very great; but when he became strong, the large horn was broken, and in place of it four notable ones came up toward the four winds of heaven. 9 And out of one of them came a little horn which grew exceedingly great toward the south, toward the east, and toward the Glorious Land. 10 And it grew up to the host of heaven; and it cast down some of the host and some of the stars to the ground, and trampled them. 11 He even exalted himself as high as the Prince of the host; and by him the daily sacrifices were taken away, and the place of His sanctuary was cast down. 12 Because of transgression, an army was given over to the horn to oppose the daily sacrifices; and he cast truth down to the ground. He did all this and prospered.
13 Then I heard a holy one speaking; and another holy one said to that certain one who was speaking, "How long will the vision be, concerning the daily sacrifices and the transgression of desolation, the giving of both the sanctuary and the host to be trampled underfoot?"
14 And he said to me, "For two thousand three hundred days; then the sanctuary shall be cleansed."
Gabriel Interprets the Vision
15 Then it happened, when I, Daniel, had seen the vision and was seeking the meaning, that suddenly there stood before me one having the appearance of a man. 16 And I heard a man's voice between the banks of the Ulai, who called, and said, "Gabriel, make this man understand the vision." 17 So he came near where I stood, and when he came I was afraid and fell on my face; but he said to me, "Understand, son of man, that the vision refers to the time of the end."
18 Now, as he was speaking with me, I was in a deep sleep with my face to the ground; but he touched me, and stood me upright. 19 And he said, "Look, I am making known to you what shall happen in the latter time of the indignation; for at the appointed time the end shall be. 20 The ram which you saw, having the two horns — they are the kings of Media and Persia. 21 And the male goat is the kingdom of Greece. The large horn that is between its eyes is the first king. 22 As for the broken horn and the four that stood up in its place, four kingdoms shall arise out of that nation, but not with its power.
23 "And in the latter time of their kingdom,
When the transgressors have reached their fullness,
A king shall arise,
Having fierce features,
Who understands sinister schemes.
24 His power shall be mighty, but not by his own power;
He shall destroy fearfully,
And shall prosper and thrive;
He shall destroy the mighty, and also the holy people.
25 "Through his cunning
He shall cause deceit to prosper under his rule;
And he shall exalt himself in his heart.
He shall destroy many in their prosperity.
He shall even rise against the Prince of princes;
But he shall be broken without human means.
26 "And the vision of the evenings and mornings
Which was told is true;
Therefore seal up the vision,
For it refers to many days in the future."
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The 2,300 year prophecy did not start until after Alexander the Great died and His Empire divided to form four kingdoms led by the four Generals who answered to Alexander the great. Alexander the Great is recorded to have died in 323 BC. around 134 years later than what the diagram suggests. But it was more than likely that the little horn that came out of one of the four horns to begin the trampling of the Sanctuary did not occur for around another 70 or so years. That was why I said that the end point of the 2,300 years of the prophecy of the little horn trampling the sanctuary will not end until around 200 years later than what the diagram indicates.
Therefore the integrity of the Diagram is in question as it does not truthfully portray the recorded prophecy in Daniel 8.
Shalom