special_numbers.rb

require 'date'

def days_in_month(year, month)
  Date.new(year, month, -1).day
end

range = 2000..2100
found = 0

print "======= SPECIAL NUMBERS SEARCH BEGIN ======\n"
print "From years: #{range}\n"
for i in range
  year = i.to_s
  for j in 1..12
    max_day = days_in_month(i,j)
    for k in 1..max_day
      whole_string = "#{k}#{j}#{i}"
      if (whole_string == whole_string.reverse)
        print "Special number found in: #{k}/#{j}/#{i}: #{whole_string} = #{whole_string.reverse}\n"
        found += 1
      end
    end
  end
end

print "\n"
print "Total special numbers found: #{found}\n"
print "Credits: nicacode.com\n"