'%y%m%d'
'%y%m%d' + '%H%M%S'
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# File 'lib/ruby_patch/time.rb', line 5 def ymd() self.strftime(YYMMDD) end
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# File 'lib/ruby_patch/time.rb', line 9 def ymdhms() self.strftime(YYMMDDHHMMSS) end