You should parse the date first. The first argument of UnixDate must be a date in the format Date::Manip uses internally - which isn't a string in the format you're using. 
$ perl -MDate::Manip -wE 'say UnixDate ParseDate("2010-04-30"), "%e/%m
+/%y"'
30/04/10
$

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In reply to Re: Problem parsing date with Date::Manip by JavaFan
in thread Problem parsing date with Date::Manip by kalyanrajsista

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