USER
Tell me how to check for valid South african ID numbers. Are there checksums? It starts with yymmdd so at least you know that 009999 is an invalid start. Write a list of all things that can be considered
ASSISTANT
Valid South African ID numbers follow a specific format and contain a few checks that can be used to determine their validity. Here is a list of things you can consider when checking the validity of a South African ID number:
- Length: A valid South African ID number should be 13 digits long.
- Birthdate: The first six digits should represent the birthdate of the person in the format YYMMDD. This means that an ID number starting with "009999" would be invalid as you mentioned.
- Gender: The 7th to 9th digits indicate the gender of the person. A value of 0000-4999 represents a female, while 5000-9999 represents a male.
- Citizenship: The 10th digit represents citizenship. A value of 0 indicates a South African citizen, while 1 indicates a permanent resident.