vb.net 簡單的年月換算，求出往回幾個月的值

Question

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 ？？

Answer 1

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