Get Week Day No and Name in Crystal Report

First Get WeekDay No using this function

WeekDay ({DateGoesHere}, firstDayOfWeek) 

date(DateTime): Any valid date, 
firstDayOfWeek(int): Possible Values[crMonday, crTuesday, crWednesday, crThursday, crFirday, crSaturday, crSunday]: Default crSunday
Then use

WeekDayName(WeekDay ({DateGoesHere}, firstDayOfWeek), false, firstDayOfWeek)