scrolled canvas , strange problem, i find something

[contro opinion]

 in my program,i want to draw  line which  date is
['2008-06-02','2008-06-03','2008-06-04','2008-06-05','2008-06-06','2008-06-09','2008-06-10']
please see  the code line  draw  130 ,what i get  is  (please see the attachment)
2010-12-15,
it is so strange thing??
i can't understand
  please  download  the data (AAU),save it in "/tmp"
and run the draw code,you can see.
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