In the third year of Cyrus king of Persia, a message was revealed to Daniel, who was named Belteshazzar. The message was true and was about a great conflict. He understood the message and had understanding of the vision.
References for Daniel 10:1
In those days I, Daniel, was mourning for three full weeks.
I didn't eat any rich food, no meat or wine entered my mouth, and I didn't put any oil [on my body] until the three weeks were over.