多项选择题
下面关于DATEDIF是()
A.DATEDIF("2019/9/23","2020/5/23",d)
B.DATEDIF("2019/9/23","2020/5/23","m")
C.DATEDIF("2020/5/23","2019/9/23","y")
D.DATEDIF("2019/9/23","2020/5/23","y")
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