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 did Jesus show His loyalty to God?
8. Did God bless and sanctify the seventh day while He was resting upon it, or when His rest on that day was past?
When, according to the Bible, does the Sabbath begin?
12. Do Catholic authorities acknowledge that there is no command in the Bible, for the sanctification of Sunday?
What has been one great characteristic of the Papacy?
What else has He promised to do?
To what place were the angels that sinned cast?

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