module Egn::Util
Constants
- WEIGHTS
Public Class Methods
determine_date(year, month)
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The EGN can have three different formats depending on the century. It can be determined by examining the month. The rules are as follows:
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For people born in 1900..1999 the month does not change
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For people born in 1800..1899 the month is increased by 20 (e.g January is 21)
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For people born in 2000..2099 the month is increased by 40 (e.g December is 52)
# File lib/egn/util.rb, line 12 def self.determine_date(year, month) case month when (1..12) year = "19#{year}" when (21..32) month -= 20 year = "18#{year}" when (41..52) month -= 40 year = "20#{year}" end [year.to_i, month] end
egn_checksum(egn)
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More information on the formula: www.grao.bg/esgraon.html#section2
# File lib/egn/util.rb, line 28 def self.egn_checksum(egn) sum = egn.chars.map(&:to_i).zip(WEIGHTS).map { |n| n.reduce(:*) }.reduce(:+) rest = sum % 11 rest < 10 ? rest : 0 end
time_rand(from = 0.0, to = Time.now)
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Get a random date
# File lib/egn/util.rb, line 36 def self.time_rand(from = 0.0, to = Time.now) Time.at(from + rand * (to.to_f - from.to_f)) end