Question

不同的日期怎么比较它们相差的天数?(vb.net)

Answer 1

直接用两个日期相减，返回一个timespan实例，它的Days属性就是天数。
dim d1 as datetime, d2 as datetime
dim days as integer
d1 = DateTime.Today.AddDays(-1)
d2 = DateTime.Today
days = (d2 - d1).Days

Answer 2

用函数：datediff("d",Date1 As DateTime, Date2 As DateTime)返回的就是Date1 与Date 2之间相差的天数。