给定一个字符串时间，如何判断它是否是日期类型？

echo123321 2004-11-25 09:39:03

类似于vb里面的iddate函数
比如我想把2003－2－29这个串拼接起来以后。怎么来判断是否是有效的日期类型。

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515189 2004-11-25

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不好意思我没看清楚楼主的意思！
public static bool IsDate(string strChkParam)
{
if (strChkParam.Length == 0) {
return true;
}
Regex regex;
if (!IsHalfEisuuji(strChkParam)) {
return false;
}
string InputFormat1 = "YYYYMMDD";
string InputFormat2 = "YYYYMM";
string InputFormat3 = "MMDD";
string InputFormat4 = "YYYY/MM/DD";
string InputFormat5 = "YYYY/MM";
string InputFormat6 = "MM/DD";
if (strChkParam.Length == InputFormat4.Length) {
regex = new System.Text.RegularExpressions.Regex("^\d{4}/\d{2}/\d{2}$");
} else if (strChkParam.Length == InputFormat5.Length) {
regex = new System.Text.RegularExpressions.Regex("^\d{4}/\d{2}$");
} else if (strChkParam.Length == InputFormat6.Length) {
regex = new System.Text.RegularExpressions.Regex("^\d{2}/\d{2}$");
}
if (!(regex == null)) {
if ((!(regex.IsMatch(strChkParam)))) {
return false;
}
}
strChkParam = strChkParam.Replace("/", "");
if (IsNumber(strChkParam)) {
if (strChkParam.Length == InputFormat3.Length) {
try {
Convert.ToDateTime(DateTime.Now.Year.ToString() + "/" + strChkParam.Substring(0, 2) + "/" + strChkParam.Substring(2, 2));
} catch (Exception ex) {
return false;
}
} else if (strChkParam.Length == InputFormat2.Length) {
try {
Convert.ToDateTime(strChkParam.Substring(0, 4) + "/" + strChkParam.Substring(4, 2) + "/01");
} catch (Exception ex) {
return false;
}
} else if (strChkParam.Length == InputFormat1.Length) {
try {
Convert.ToDateTime(strChkParam.Substring(0, 4) + "/" + strChkParam.Substring(4, 2) + "/" + strChkParam.Substring(6, 2));
} catch (Exception ex) {
return false;
}
} else {
return false;
}
} else {
return false;
}
return true;
}

515189 2004-11-25

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Public Shared Function IsDate(ByVal strChkParam As String) As Boolean
If strChkParam.Length = 0 Then Return True
Dim regex As Regex

If Not IsHalfEisuuji(strChkParam) Then
Return False
End If

Dim InputFormat1 As String = "YYYYMMDD"
Dim InputFormat2 As String = "YYYYMM"
Dim InputFormat3 As String = "MMDD"
Dim InputFormat4 As String = "YYYY/MM/DD"
Dim InputFormat5 As String = "YYYY/MM"
Dim InputFormat6 As String = "MM/DD"

Select Case strChkParam.Length
Case InputFormat4.Length
regex = New System.Text.RegularExpressions.Regex("^\d{4}/\d{2}/\d{2}$")
Case InputFormat5.Length
regex = New System.Text.RegularExpressions.Regex("^\d{4}/\d{2}$")
Case InputFormat6.Length
regex = New System.Text.RegularExpressions.Regex("^\d{2}/\d{2}$")
End Select

If Not (regex Is Nothing) Then
If (Not (regex.IsMatch(strChkParam))) Then
Return False
End If
End If

strChkParam = strChkParam.Replace("/", "")
If IsNumber(strChkParam) Then
Select Case strChkParam.Length
Case InputFormat3.Length
Try
Convert.ToDateTime(DateTime.Now.Year.ToString() + "/" + strChkParam.Substring(0, 2) + "/" + strChkParam.Substring(2, 2))
Catch ex As Exception
Return False
End Try
Case InputFormat2.Length
Try
Convert.ToDateTime(strChkParam.Substring(0, 4) + "/" + strChkParam.Substring(4, 2) + "/01")
Catch ex As Exception
Return False
End Try
Case InputFormat1.Length
Try
Convert.ToDateTime(strChkParam.Substring(0, 4) + "/" + strChkParam.Substring(4, 2) + "/" + strChkParam.Substring(6, 2))
Catch ex As Exception
Return False
End Try
Case Else
Return False
End Select
Else
Return False
End If

Return True

End Function

515189 2004-11-25

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Public Shared Function IsNumber(ByVal strChkParam As String) As Boolean
If strChkParam.Length = 0 Then Return True
Dim regex As Regex
If IsHalfEisuuji(strChkParam) Then
regex = New System.Text.RegularExpressions.Regex("^\d*$")
If regex.IsMatch(strChkParam) And IsHalfEisuuji(strChkParam) Then
Return True
End If
End If

Return False

End Function

活靶子哥哥 2004-11-25

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<%@Page Language="c#" Debug="true"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="gb2312" lang="gb2312">
<head>
<title> New Document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="title" content="" />
<meta name="author" content="活靶子,Huobazi,www.AspxBoy.com" />
<meta name="subject" content="" />
<meta name="language" content="gb2312" />
<meta name="keywords" content="" />
<meta name="Copyright" content="www.AspxBoy.com" />
<meta name="robots" content="all" />
<script langauge="c#" runat="server">

void Page_Load(object o , EventArgs e)
{

if(!Page.IsPostBack)
{
Response.Write(IsDate("2003－2－28"));
Response.Write("<br />");
Response.Write(IsDate("2003－2－29"));
Response.Write("<br />");
Response.Write(IsDate("2003－222－29"));

}

}
/// <summary>
/// 检验字符串是否是合法的日期
/// </summary>
/// <param name="strDate">被检验的字符串</param>
/// <returns>bool</returns>

public bool IsDate(string strDate)
{
DateTime dtDate;
bool bValid = true;
try
{
dtDate = DateTime.Parse(strDate);
}
catch
(FormatException e)
{
bValid = false;
}
return bValid;
}

</script>
</head>
<body>
<form id="frm" runat="server">

</form>
</body>
</html>

ALLsharps 2004-11-25