It is in you canon mister... the Church established by Jesus Christ did come together to break bread on the first day of the week -> Sunday.
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.
That is just a reference from your infallible book. As I understand the restoration - it was a restoration of authority and revelation. So, if God were to say (through a prophet) that the sabbath will be on Tuesdays from hence forth - that would be the new day of worship. Scripture is just a historic reference to revealed religion.
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