8000 Compute birth date from Belgian National Number · unho/python-stdnum@bda2a9c · GitHub
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Compute birth date from Belgian National Number
Closes arthurdejong#288
1 parent e2a2774 commit bda2a9c

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‎stdnum/be/nn.py

Lines changed: 19 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
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# coding=utf-8
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# nn.py - function for handling Belgian national numbers
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#
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# Copyright (C) 2021 Cédric Krier
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# Copyright (C) 2021-2022 Cédric Krier
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
@@ -39,6 +39,8 @@
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InvalidChecksum: ...
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>>> format('85073003328')
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'85.07.30-033.28'
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>>> get_birth_date('85.07.30-033 28')
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datetime.date(1985, 7, 30)
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"""
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import datetime
@@ -55,13 +57,13 @@ def compact(number):
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def _checksum(number):
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"""Calculate the checksum."""
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"""Calculate the checksum and return the detected century."""
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numbers = [number]
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if int(number[:2]) + 2000 <= datetime.date.today().year:
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numbers.append('2' + number)
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for n in numbers:
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for century, n in zip((19, 20), numbers):
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if 97 - (int(n[:-2]) % 97) == int(n[-2:]):
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return True
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return century
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return False
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@@ -91,3 +93,16 @@ def format(number):
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return (
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'.'.join(number[i:i + 2] for i in range(0, 6, 2)) +
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'-' + '.'.join([number[6:9], number[9:11]]))
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def get_birth_date(number):
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"""Return the date of birth"""
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number = compact(number)
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century = _checksum(number)
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if not century:
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raise InvalidChecksum()
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try:
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return datetime.datetime.strptime(
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str(century) + number[:6], '%Y%m%d').date()
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except ValueError:
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raise InvalidComponent()

‎tests/test_be_nn.doctest

Lines changed: 42 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,42 @@
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test_be_nn.doctest - more detailed doctests for stdnum.be.nn module
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Copyright (C) 2022 Arthur de Jong
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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This file contains more detailed doctests for the stdnum.be.nn module. It
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tries to test more corner cases and detailed functionality that is not
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really useful as module documentation.
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>>> from stdnum.be import nn
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Extra tests for getting birth date
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>>> nn.get_birth_date('85.07.30-033 28')
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datetime.date(1985, 7, 30)
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>>> nn.get_birth_date('17 07 30 033 84')
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datetime.date(2017, 7, 30)
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>>> nn.get_birth_date('12345678901')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> nn.get_birth_date('00 00 01 003-64') # 2000-00-00 is not a valid date
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Traceback (most recent call last):
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...
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InvalidComponent: ...

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