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Generate valid Swedish personnummer.
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# 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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