static bool ValidateUniqueIdentifierNumbers(SocialSecurityNumberParts ssn)
{
var firstNine = $"{ssn.Date.ToString("yyMMdd")}{ssn.UniqueIdentifier.Substring(0, 3)}";
var checkNumber = ssn.UniqueIdentifier.Substring(3, 1);
var isValidLuhn = LuhnChecker.Check(firstNine, checkNumber);
return(isValidLuhn);
}
static SocialSecurityNumberParts ParseSsn(string ssn)
{
var partedSocialSecurityNumber = new SocialSecurityNumberParts();
string longYear;
string month;
string day;
try
{
if (ssn.Length == 10)
{
var shortYear = int.Parse(ssn.Substring(0, 2));
if (shortYear > (DateTime.UtcNow.Year % 100))
{
longYear = "19" + shortYear;
}
else
{
longYear = "20" + shortYear;
}
month = ssn.Substring(2, 2);
day = ssn.Substring(4, 2);
partedSocialSecurityNumber.UniqueIdentifier = ssn.Substring(6, 4);
}
else if (ssn.Length == 12)
{
longYear = ssn.Substring(0, 4);
month = ssn.Substring(4, 2);
day = ssn.Substring(6, 2);
partedSocialSecurityNumber.UniqueIdentifier = ssn.Substring(8, 4);
}
else
{
return(null);
}
var successfullyParsedDate = DateTime.TryParse($"{longYear}-{month}-{day}", out var dateOfBirth);
if (successfullyParsedDate)
{
partedSocialSecurityNumber.Date = dateOfBirth;
return(partedSocialSecurityNumber);
}
else
{
return(null);
}
}
catch (Exception ex)
{
return(null);
}
}