dim EndYear as long=2019
dim EndMonth as long=3
比如指定6個月前則為, 2018年10月,這個要怎麼用上面的來推算
dim StartYear as long=2018 ??
dim StartMonth as long=10 ??
Dim dt As DateTime = new DateTime(EndYear, EndMonth, 1)
dt = dt.AddMonth(-6)
dim StartYear as long = dt.Year
dim StartMonth as long = dt.Month