Hi,
Actually, we do know that Daniel 9:24-27 was written prior to it's fulfillment. Even secular, naturalistic historians ascribe a date of around 168 BC to Daniel. This is because they refuse to accept the remarkable fulfillment of it's prophecies regarding the Medo Persian, Chaldean, Grecian and Roman Empires. They would date it later if they could, but they can't because of the historical evidence. Multiple Daniel manuscripts were found among the dead Sea scrolls.
The remarkable prophecy regarding the Suffering Servant is also found in the Dead Sea Scroll's Great Isaiah Scroll, dated 100-150 BC. I invite you to read this translation of that passage from The Great Isaiah Scroll:
Column XLIV Isaiah 52:13 to 54:4
1. (Chapter 52:13.) Behold, my servant shall deal prudently, he shall be exalted and lifted up, and be very high (14.) as those who were astonished
2. at him are many; because his visage was marred more than any man, and his form more than the sons of men:
3. (15.) So shall he startle many nations; the kings shall shut their mouths at him: for that which
4. was not told to them shall they see; and that which they had not heard shall they consider.
5. (Chapter 53:1) Who has believed our report and the arm of YHWH to whom has it been revealed (2) And he shall come up like a suckling before us
6. and as a root from dry ground there is no form to him and no beauty to him and in his being seen and there is no appearance
7. that we should desire him. (3) He is despised and rejected of men, a man of sorrows and knowing grief
8. and as though hiding faces from him he was despised and we did not esteem him. (4) Surely our griefs he
9. is bearing and our sorrows he carried them and we esteemed him beaten and struck by God
[There is a scribal thumb print over lines 10 to 12.]
10. and afflicted. (5) and he is wounded for our transgressions, and crushed for our iniquities, the correction
11. of our peace was upon him and by his wounds he has healed us. (6) All of us like sheep have wandered each man to his own way
12. we have turned and YHWH has caused to light on him the iniquity of all of us (7) He was oppressed and he was afflicted and he did not
13. open his mouth, as a lamb to the slaughter he is brought and as a ewe before her shearers is made dumb he did not open
14. his mouth. (8) From prison and from judgement he was taken and his generation who shall discuss it because he was cut off from the land of
15. the living. Because from the transgressions of his people a wound was to him (PP)
16. (9) And they gave wicked ones to be his grave and [a scribbled word probably accusative sign "eth"] rich ones in his death
17. although he worked no violence neither deceit in his mouth (10) And YHWH was pleased to crush him and He has caused him grief. (PP)
18. If you will appoint his soul a sin offering he will see his seed and he will lengthen his days and the pleasure of YHWH {&yod?&]
19. in his hand will advance. (11) Of the toil of his soul he shall see {+light+} and he shall be satisfied and by his knowledge shall he make righteous
20. even my righteous servant for many and their iniquities he will bear. (12) Therefore I will apportion to him among the great ones
21. and with the mighty ones he shall divide the spoil because he laid bare to death his soul and with the transgressors
22. he was numbered, and he, the sins of many, he bore, and for their transgressions he entreated.(PP)
(
http://www.ao.net/~fmoeller/qa-tran.htm)
Both of these prophecies were undeniably written at least 100 years prior to their fulfillment by Jesus. And these are not the only ones; I can provide you with more. You asked for evidence. Now you have it.
In Christ,
Rusty Entrekin