On what day was John in the Spirit?

Answer

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

Is there to be a special message for the last days?
By what did Peter, on the day of Pentecost, say that Christ had been approved by God?
By what comparison is it shown that the heavenly sanctuary will he cleansed?
Can man of himself, unaided by Christ, keep the law?
Did they observe it after His resurrection?
When this sign appeared, what were the disciples to do?
In perfecting character, what must come to all?

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