Suppose you want to return 1 = Sunday, 2 = Monday…..7 = Saturday

=TEXT(A1&"Jan2017","dddd")

To show only 3 characters of the Weekday Name

=TEXT(A1&"Jan2017","ddd")

You can add a number to A1 if you want to show some other Weekday Name

Say, if you want to show 1 = Monday, 2 = Tuesday…….7 = Sunday, just add 1 to A1

=TEXT(A1+1&"Jan2017","dddd")

Say, if you want to show 1 = Friday, 2 = Saturday…….7 = Thursday, just add 5 to A1

=TEXT(A1+5&"Jan2017","dddd")