When did God create angels? We do know that God created the angels before he created the physical universe. The book of Job describes the angels worshipping God as He was creating the world.
If we examine the function of angels, we might conclude that God created the angels just before to the creation of mankind because one of their jobs is to be “ministering spirits sent to serve those who will inherit salvation” (Hebrews 1:14).
So, although the Bible does not specifically say when God created the angels, it was sometime before the world was created. Whether this was a day before, or billions of years before, we cannot be sure.