At what time was Daniel's second vision given?

Answer

"In the first year of Belshazzar king of Babylon Daniel had a dream and visions of his head upon his bed:
then he wrote the dream, and told the sum of the matters." Dan. 7:1.
NOTE - That is, in the first year of Belshazzar's office as associate king with his father
Nabonadius, or 540 BC.

By what should we test, or prove, all doctrine?
What did the prophet see in this vision?
When were the first of these signs to appear, and what were they to be?
What part will the angels have in this event?
How much do the dead know of what is going on among men?
Of whom does the Bible teach that God is a rewarder?
Who will dwell with the redeemed?

Questions & Answers are from the book Bible Readings for the Home Circle