There are situation where we need to validate dates received in different formats and we want to make sure that the given date is valid as per the format required.

//Example 1 - Validate Date for the format DD/MM/YYYY 
private bool ValidateDate(string stringDateValue)
{
    try
    {
        CultureInfo CultureInfoDateCulture = new CultureInfo("fr-FR");
        DateTime d = DateTime.ParseExact(stringDateValue, "dd/MM/yyyy", CultureInfoDateCulture);
        return true;
    }
    catch
    {
        return false;
    }
}

//Example 2 - Validate Date for the format MM/DD/YYYY 
private bool ValidateDate(string stringDateValue)
{
    try
    {
        CultureInfo CultureInfoDateCulture = new CultureInfo("en-US");
        DateTime d = DateTime.ParseExact(stringDateValue, "MM/dd/yyyy", CultureInfoDateCulture);
        return true;
    }
    catch
    {
        return false;
    }
}

//Example 3 - Validate Date for the format YYYY/MM/DD 
private bool ValidateDate(string stringDateValue)
{
    try
    {
        CultureInfo CultureInfoDateCulture = new CultureInfo("ja-JP");
        DateTime d = DateTime.ParseExact(stringDateValue, "yyyy/MM/dd", CultureInfoDateCulture);
        return true;
    }
    catch
    {
        return false;
    }
}

Example 3 - Validate Date for the format DDMMYYYY 
private bool ValidateDate(string stringDateValue)
{
    try
    {
        CultureInfo CultureInfoDateCulture = new CultureInfo("fr-FR");
        DateTime d = DateTime.ParseExact(stringDateValue, "ddMMyyyy", CultureInfoDateCulture);
        return true;
    }
    catch
    {
        return false;
    }
}

//Example 4 - Validate Date for the format MMDDYYYY 
private bool ValidateDate(string stringDateValue)
{
    try
    {
        CultureInfo CultureInfoDateCulture = new CultureInfo("en-US");
        DateTime d = DateTime.ParseExact(stringDateValue, "MMddyyyy", CultureInfoDateCulture);
        return true;
    }
    catch
    {
        return false;
    }
}

//Example 5 - Validate Date for the format MMDDYYYYHHMMSS 
private bool ValidateDate(string stringDateValue)
{
    try
    {
        CultureInfo CultureInfoDateCulture = new CultureInfo("en-US");
        DateTime d = DateTime.ParseExact(stringDateValue, "MMddyyyyHHmmss", CultureInfoDateCulture);
        return true;
    }
    catch
    {
        return false;
    }
}