Sabbath in biblical times was sundown Friday to sundown Saturday.I suppose Chic-Fil-A is the only restaurant business in the US still following the Biblical commands of keeping the Sabbath Holy. 99% of all other businesses and church members seem to have leaned towards the other Biblical statement that having "an ox in the ditch" family support emergency allows ignoring the first one.
(Jesus speaking to the lawyers and Pharisees in Luke 14 defending the accused man of violating the Sabbath if I am not mistaken)