bchavez/Bogus · error · ArgumentOutOfRangeException

{nameof(year)} must be between 1854 and 2039.

Error message

{nameof(year)} must be between 1854 and 2039.

What it means

ExtensionsForNorway.Fodselsnummer's individual-number generator covers only 1854-1899, 1900-1999, 2000-2039. Any other birth year throws ArgumentOutOfRangeException. These ranges reflect the real Norwegian fødselsnummer allocation rules.

Source

Thrown at Source/Bogus/Extensions/Norway/ExtensionsForNorway.cs:87

      if (1854 <= year && year <= 1899)
      {
         from = 500;
         to = 749;
      }
      else if (1900 <= year && year <= 1999)
      {
         from = 0;
         to = 499;
      }
      else if (2000 <= year && year <= 2039)
      {
         from = 500;
         to = 999;
      }
      else
      {
         throw new ArgumentOutOfRangeException(nameof(year), $"{nameof(year)} must be between 1854 and 2039.");
      }

      int individualNumber = gender == DataSets.Name.Gender.Female ? r.Even(from, to) : r.Odd(from, to);

      return individualNumber.ToString("D3");
   }

   private static bool GenerateChecksum(string birthDate, string individualNumber, out string checksum)
   {
      int d1 = int.Parse(birthDate.Substring(0, 1));
      int d2 = int.Parse(birthDate.Substring(1, 1));
      int m1 = int.Parse(birthDate.Substring(2, 1));
      int m2 = int.Parse(birthDate.Substring(3, 1));
      int y1 = int.Parse(birthDate.Substring(4, 1));
      int y2 = int.Parse(birthDate.Substring(5, 1));
      int i1 = int.Parse(individualNumber.Substring(0, 1));
      int i2 = int.Parse(individualNumber.Substring(1, 1));
      int i3 = int.Parse(individualNumber.Substring(2, 1));

View on GitHub (pinned to 6ece18c5c2)

Solutions

1. Constrain Person.DateOfBirth to 1854-2039 before calling Fodselsnummer.
2. Use f.Date.Between(new DateTime(1900,1,1), DateTime.Today) for realistic birth dates.
3. Do not set DateOfBirth to dates beyond 2039 for Norwegian IDs.

Example fix

// before
person.DateOfBirth = new DateTime(1850, 1, 1);
var fn = person.Fodselsnummer();

// after
person.DateOfBirth = f.Date.Between(new DateTime(1920,1,1), DateTime.Today);
var fn = person.Fodselsnummer();

int year = person.DateOfBirth.Year;
if (year < 1854 || year > 2039)
    throw new ArgumentOutOfRangeException(nameof(year), "Norwegian fødselsnummer requires 1854-2039.");
var fn = person.Fodselsnummer();

static bool NorwegianYearOk(int y) => y >= 1854 && y <= 2039;

When it happens

Trigger: Calling person.Fodselsnummer() on a Person whose DateOfBirth.Year is below 1854 or above 2039.

Common situations: Setting DateOfBirth to a date outside the supported era (e.g. a 2100 future-date fixture) and then generating a Norwegian national ID.

Related errors

• {nameof(year)} must be between 1858 and 2057.
• PESEL for the year below 1800 is invalid.
• PESEL for year above 2300 is invalid.
• {nameof(p.DateOfBirth.Year)} must be between 1900 and 2099.
• Gender not handled.

AI-assisted analysis of bchavez/Bogus@6ece18c5c2 (2026-08-13). Data as JSON: /api/errors/57dad62aef2e97c4. Report an issue: GitHub.