Do Protestant writers acknowledge the same?

Answer

They do.
NOTE - "IS there no express commandment for observing the first day of the week as Sabbath,
instead of the seventh day?-None whatever. Neither Christ, nor His apostles, nor the first Christians
celebrated the first day of the week instead of the seventh as the Sabbath."-New York Weekly Tribune,
May 24, 1900.
"The Scriptures nowhere call the first day of the week the Sabbath. . . . There is no Scriptural
authority for so doing, nor of course any Scriptural obligation." The Watchman (Baptist).
"The observance of the first instead of the seventh day rests on the testimony of the church, and
the church alone.' -- Hobart Church News, July 2, 1894.
For additional testimonies, see reading on page 146.

How was Christ's first advent to be heralded?
What was done with the blood of the offering?
4. What was another memorial instituted to commemorate another signal providence in behalf of the Israelites?
At Corinth what did he do on the Sabbath days?
Does the Papacy acknowledge that it has changed the Sabbath?
What will the waiting ones say when Jesus comes?
What definite period is mentioned under this trumpet?

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