In the third year of Persia's King Cyrus, a message was revealed to Daniel, who was called Belteshazzar. The message was true: there would be a great conflict. Daniel understood the message, having discerned the meaning of the vision.
References for Daniel 10:1
During that time, I, Daniel, had been mourning for three weeks.
I didn't eat any rich foods. Neither meat nor wine passed my lips, and I didn't clean up at all until the three weeks were up.