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  1. require 'date'
  2.  
  3. input_format = "%Y%m%d"
  4. d1 = Date.strptime(gets, input_format)
  5. d2 = Date.strptime(gets, input_format)
  6.  
  7. puts d2 - d1
  8.  
Success #stdin #stdout 0.06s 10008KB
stdin
20150401
20151203

stdout
246/1