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;
    }
}