Daniel 9:26 And after threescore and two weeks shall Messiah be cut off, but not for himself: and the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof shall be with a flood, and unto the end of the war desolations are determined.
Here in this prophesy we see 69 weeks till the messiah comes. the days are interpretted as years leading to 483 years. It qalso says that the city and sanctuary would be destroyed. We see this happened in 72. AD.
Now Christ came before this. But there can not be another messiah afterwards. Therefore if there is a messiah it must be christ.