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nysalor/uniquedate_count.rb

Last active December 15, 2015 18:18
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uniquedate_count.rb
(Date.new(2001,1,1)..Date.new(2019,12,31)).select { |x|
str = x.to_s.gsub('-0','')
str.split('').uniq.size == str.size
}.size
=> 210
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