Acts 20:7
"And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight."
We should not read into this text more than what it says. Why were they gathered on the first day of the week?
Because paul was going to depart the next day.
When did this meeting take place?
Verse 8 tells us.
"And there were many lights in the upper chamber, where they were gathered together"
It was at night time. According to Jewish reckoning that would make it a Saturday night. Not Sunday at all.
If Paul considered Sunday as sacred then why would he spend the entire day travelling and not at worship.
Paul was a Sabbath keeper.
Acts 13:42-44
"As Paul and Barnabas left the meeting house the people said, `Tell us these things again next Sabbath day.'
43 The meeting was finished. There were many Jews, also those who were not Jews but worshipped God. They followed Paul and Barnabas. Paul and Barnabus kept talking to the people and told them to keep on living in the way that will bring God's blessing.
44 The next Sabbath day almost all of the people in that city gathered to hear God's word."
Acts 17:2
"As he had done in other places, Paul went into it. On three Sabbath days he explained what was written in the holy writings."
Acts 16:13
"On the Sabbath day we went out of the city to the river. We thought this was a place where people met to talk with God. So we sat down and talked to the women who had come there."
Acts 18:4
"Every Sabbath day he talked with the people in the meeting place for the Jews. He tried to talk so that the Jews and the Greeks would believe"
In all of this it is plain to see that Paul was a Sabbath keeper. The Sabbath being the same Sabbath that the Jews kept. That being the seventh day of the week.
Update, forgive me, I didn't notice the Australia flag. Let me use a different example..."Yesterday, when the sun came up..." You know exactly what when - the morning - it happens every day.
Thanks for bringing that to my notice.
Amen to John's post.