vba weekdayname
WeekdayName(weekday, [ abbreviate ], [ firstdayofweek])
' abbreviate: default False (Monday vs Mon)
' firstdayofweek:
' vbUseSystem 0 API NLS parameter
' vbSunday 1 [Default]
' vbMonday 2
' vbTuesday 3
' vbWednesday 4
' vbThursday 5
' vbFriday 6
' vbSaturday 7