Chapter 10 is dated to the third year of Koresh. The descriptions of Koresh in Yeshayahu and in Ezra imply that he showed kindness towards the Jews and acted as God's emissary. Daniel’s mourning and the angel’s message to Daniel seem to lead to a conclusion that after giving permission to build the Beit HaMikdash, Koresh suspended this permission. Daniel’s vision takes place on the 24th of the month. The 24th of the month comes up repeatedly throughout prophecies in the period of the building of the second Beit HaMikdash.

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion