Oh, one other way of writing dates in Sweden is used for writing date of birth: yymmdd
Our SSN or ID number is based on this: Date of birth plus four digits making up a checksum and indicating gender.
Thus a boy born today would get a number something like this 030404-0118
(I haven't calculated the checksum, so it's most likely not a real number)
This number is used instead of your name everywhere: Tax authority, education, medical care, you name it.
