在日常录入EXCEL表格的单元格里 ，我们输入一些一般性的日期内容，如：2017-10-17 或 2017/10/17时，EXCEL会自动识别为日期并按单元格设计格式显示，单元格中存储的值也是日期格式的值。
但我们进行不规范的日期输入时，如在单元格中输入：2017.10.10或2017。10。10或20171010时，EXCEL不会自动识别这些内容为日期，而只会识别为字符串（文本），且在单元格中存储的也只是文本而已。
我们通过编写VBA代码可以轻松解决此问题，让EXCEL完美识别输入的任何日期内容，不管是20171010或2017.10.10还是201711或20170101或2017131都可被正确识别，而且是直接将单元格中存储的值转换为日期值，不仅仅是显示格式的转换。
闲话不说，直接让VBA代码：
(要录入VBA代码，必须通过EXCEL进入VBA编辑器，这部分内容可搜索下)
'以下代码都要放到一个sheet的类模块之中
Dim nDate
Private Sub Worksheet_Activate()'加载sheet的事件
nDate = InputBox("请确定此工作表中第几列为日期型的数据！", "输入数字", "")
If nDate = "" Then
nDate = 2 '--只操作指定的列号的列，目前只操作B列（第2列）
Else
nDate = Val(nDate)
End If
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)'--sheet中任何地方发生数据改变时触发的事件
If nDate = Then Exit Sub
If Target.Cells.Column = nDate Then '--如果是第二列才检验文本为日期
Target.Value = TryChangeDate2(Target.Value)
End If
End Sub
Public Function TryChangeDate2(ByVal strDATEcome As String) As Variant
On Error GoTo TryChangeDate2ERR
Dim strDATE As String
strDATE = Trim(strDATEcome)
Dim myDate As Date
Dim strK As String
strK = mTrim(strDATEcome)
Dim k As Integer, nkkkk As Integer
k = -
k0:
k =
myDate = DateValue(strDATE)
myDate = Format(myDate, "yyyy/m/d")
TryChangeDate2 = myDate
Exit Function
k1:
k =
myDate = DateValue(strDATE)
myDate = Format(myDate, "yyyy/m/d")
TryChangeDate2 = myDate
Exit Function
TryChangeDate2ERR:
Err.Clear
If k = Then
nkkkk = Len(strK)
Select Case nkkkk
Case
If InStr(, strK, ".") = And InStr(, strK, ",") = And InStr(, strK, "/") = And InStr(, strK, "\") = And InStr(, strK, "-") = Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
Case
If InStr(, strK, ".") = And InStr(, strK, ",") = And InStr(, strK, "/") = And InStr(, strK, "\") = And InStr(, strK, "-") = Then
If Val(Mid(strK, , )) >= Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Else
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
End If
Case
If InStr(, strK, ".") = And InStr(, strK, ",") = And InStr(, strK, "/") = And InStr(, strK, "\") = And InStr(, strK, "-") = Then
If Left(strK, ) = "" Or Left(strK, ) = "" Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Else
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
GoTo theEnd
End If
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Case
If InStr(, strK, ".") = And InStr(, strK, ",") = And InStr(, strK, "/") = And InStr(, strK, "\") = And InStr(, strK, "-") = Then
If Val(Mid(strK, , )) >= Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Else
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
Else
If Val(Mid(strK, , )) >= Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Else
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
End If
Case
If InStr(, strK, ".") = And InStr(, strK, ",") = And InStr(, strK, "/") = And InStr(, strK, "\") = And InStr(, strK, "-") = Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Else
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
Case
If Val(Mid(strK, , )) >= Then
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
Else
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End If
Case
strDATE = Left(strK, ) & "/" & Mid(strK, , ) & "/" & Mid(strK, , )
End Select
theEnd:
GoTo k1
End If
TryChangeDate2 = strDATEcome
End Function Public Function mTrim(ByVal strCome As String) As String
'--此函数的作用是去掉字符串中间的空格
On Error GoTo mTrimErr
Dim i As Integer, j As Integer
Dim strLS As String, k As String * , strResult As String
strLS = Trim(strCome)
strResult = ""
j = Len(strLS)
For i = To j
k = Mid(strLS, i, )
If k <> " " And k <> " " And VarType(k) <> vbNull And k <> vbNullString Then
strResult = strResult & k
End If
Next
mTrim = strResult
Exit Function
mTrimErr:
Err.Clear
mTrim = strCome
End Function '---以上代码可实现在EXCEL指定列（上面指定为B列）中录入日期内容时，任意可识别的日期都会被自动转换成标准日期值，并以日期值存储在单元格中
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