in reply to Re: Sorting a textfile by a date field
in thread Sorting a textfile by a date field

Or use Data::Sorting to gloss over the details of the transform: 
use Date::Manip;
use Data::Sorting qw( sort_array );

my @array = <DATA>;
sort_array( @array, sub { ParseDate( (shift) =~ /\t([^\t])$/ ) } );

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