mysql string to date -

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how can convert string/varchar '12-mar-2013' date 2013-03-12?

i tried 

select str_to_date('12-mar-2013','%y-%m-%d');  select date_format('12-mar-2013','%y-%m-%d');

but both return null.

my current database version 5.5.7-rc.

use str_to_date.

try

select str_to_date('12-mar-2013','%d-%m-%y');  ->   2013-03-12

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