Question

我的代码有什么问题？

    Dim iYearOld As Integer = 2010
    Dim iYearNow As Integer = 2014

    Dim iAge As Integer
    iAge = DateDiff("y", iYearOld, iYearNow)

错误

“无效的强制转换：参数'Date1'无法强制转换为类型日期”

有人可以帮忙吗？谢谢！

Answer 1

错误信息清楚地告诉你出了什么问题。

DateDiff需要2个日期参数，而你传递2个整数。

http://msdn.microsoft.com/en-us/library/b5xbyt6f(v=vs.90).aspx

Answer 2

我的代码有什么问题？

您要将整数发送到需要日期的函数：

DateDiff

Answer 3

第二个permeter，第三个是日期不是整数

Dim datTim1 As Date = #1/4/2001#
Dim datTim2 As Date = #1/9/2001#
' Assume Sunday is specified as first day of the week. 
Dim wD As Long = DateDiff(DateInterval.Weekday, datTim1, datTim2)
Dim wY As Long = DateDiff(DateInterval.WeekOfYear, datTim1, datTim2)

VB.NET日期无效转换

3 个答案: