To find whether the record creation Date is Weekday or Weekend it would be simple formula.,
CASE (MOD ( CreatedDate – DATE (1900, 1, 7), 7), 0, “Weekend”, 6, “Weekend”, “Weekday”,NULL)
To find Day of the record creation date use the below,
————————Hope this will help you!——————————-


CASE (MOD ( CreatedDate - DATE (1900,1,7),7),0,"Sunday",1,"Monday",2,"Tuesday",3,"Wednesday",4,"Thursday",5,"Friday",6,"Saturday”, “Error",NULL)