如果希望计算当前系统日期是当年的第几天，正确的计算公式是()

A.Adatedif(date(year(today()),1,1),today(),”d”)

B.datedif(today(),date(year(today()),1,1),”d”)

C.datedif(date(year(today()),1,1),today(),”1”)

D.datedif(today(),date(year(today()),1,1),”d”)