Swdeden personalidentitynumber - format acceptance and age validations

[teebu]

https://swedish.identityinfo.net/personalidentitynumber

The format states the [-+] are optional.

• 11900102-2384 -> invalid because it needs + to indicate over 100 years of age, also im thinking 1800 should be a cutoff.
  119001022384 would also be an acceptable format, but not pass due to 1800 cutoff (1190 is YYYY)
• 5505260017 -> valid because - is optional
• 198902255630 -> valid because - is optional
• 19781204+0009 -> invalid because + indicates age is over 100 years
• 19200102-0755 -> invalid because - indicates the age is under 100 years

[teebu]

I wonder if the - and + gets assigned only once during creation, and gets updated after a person turns 100 to make it accurate after they roll over 100 mark. I bet that doesn't happen often, most people don't live that long. 🤔

What happens to old records that were accurate at the time of entry with - but not today, as many years have passed and rolled them over 100 mark.

Probably explains why they are optional and use full year.

[koblas]

I've been working on this... It makes sense to "fix" the year to 4 digits and perform all validation after that. Not "stress" over the +- difference for the long form version.