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Generate valid Swedish personnummer.
# Generator for valid Swedish personnummer: http://en.wikipedia.org/wiki/Personal_identity_number_(Sweden)
# By Henrik Nyh <http://henrik.nyh.se> 2009-01-29 under the MIT license.
require 'date'
module Personnummer
def self.generate(date=nil, serial=nil)
date ||= Date.new(1900+rand(100), 1+rand(12), 1+rand(28))
serial = serial ? serial.to_s : format("%03d", 1+rand(999)) # 001-999
date_part = date.strftime('%y%m%d')
pnr = [date_part, serial].join
digits = []
pnr.split('').each_with_index do |n,i|
digits << n.to_i * (2 - i % 2)
end
sum = digits.join.split('').inject(0) {|sum,digit| sum + digit.to_i }
checksum = 10 - sum % 10
checksum = 0 if checksum == 10
"#{date_part}-#{serial}#{checksum}"
end
end
if $0 == __FILE__
# Randomize every part
puts Personnummer.generate
# Use given date, randomize serial
puts Personnummer.generate(Date.new(1975,1,1))
# Use given date and serial, calculate checksum
puts Personnummer.generate(Date.new(1975,1,1), 123)
end
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