using System.Text.RegularExpressions;
public static bool IsDateTime(string strValue)
{
if( null == strValue )
{
return false;
}

string regexDate = @"[1-2]{1}[0-9]{3}((-|\/){1}(([0]?[1-9]{1})|(1[0-2]{1}))((-|\/){1}((([0]?[1-9]{1})|([1-2]{1}[0-9]{1})|(3[0-1]{1})))( (([0-1]{1}[0-9]{1})|2[0-3]{1}):([0-5]{1}[0-9]{1}):([0-5]{1}[0-9]{1})(\.[0-9]{3})?)?)?)?$";

if ( Regex.IsMatch(strValue,regexDate) )
{
//以下各月份日期验证，保证验证的完整性
int _IndexY = -1;
int _IndexM = -1;
int _IndexD = -1;

if ( -1 != (_IndexY = strValue.IndexOf("-")) )
{
_IndexM = strValue.IndexOf("-",_IndexY + 1);
_IndexD = strValue.IndexOf(":");
}
else
{
_IndexY = strValue.IndexOf("/");
_IndexM = strValue.IndexOf("/",_IndexY + 1);
_IndexD = strValue.IndexOf(":");
}

//不包含日期部分，直接返回true
if ( -1 == _IndexM )
return true;

if ( -1 == _IndexD )
{
_IndexD = strValue.Length + 3;
}

int iYear = Convert.ToInt32(strValue.Substring(0,_IndexY));
int iMonth = Convert.ToInt32(strValue.Substring(_IndexY + 1,_IndexM - _IndexY - 1));
int iDate = Convert.ToInt32(strValue.Substring(_IndexM + 1,_IndexD - _IndexM - 4));

//判断月份日期
if ( ( iMonth < 8 && 1 == iMonth % 2 ) || ( iMonth > 8 && 0 == iMonth % 2 ) )
{
if ( iDate < 32 )
return true;
}
else
{
if ( iMonth != 2 )
{
if ( iDate < 31 )
return true;
}
else
{
//闰年
if ( ( 0 == iYear % 400 ) || ( 0 == iYear % 4 && 0 < iYear % 100 ) )
{
if ( iDate < 30 )
return true;
}
else
{
if ( iDate < 29 )
return true;
}
}
}
}

return false;
}