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()

AAdatedif(date(year(today()),1,1),today(),”d”)

Bdatedif(today(),date(year(today()),1,1),”d”)

Cdatedif(date(year(today()),1,1),today(),”1”)

Ddatedif(today(),date(year(today()),1,1),”d”)