On what day does John say he was in the Spirit?

Answer

"I was in the Spirit on the Lord's day." Rev. 1: 10.

How may we know that we are the sons of God?
With what, therefore, is the faith of Jesus joined?
What chapter in the Bible is devoted to faith?
For what have we been taught to pray?
18. Answering the question as to what would be the sign of His coming and the end of the world, what did Christ say?
Who alone knows the exact day of Christ's coming?
What did David say with reference to his being afflicted?

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