Split out the bits of the datetime your interested in using substr.

my $dt = '20090405022100';

my $d = substr $dt,0,8;
my $t = substr $dt,8;

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Then read the perlfaq on sort How do I sort an array by (anything)?

In reply to Re: Date to be sorted in descending and time in ascending by RichardK
in thread Date to be sorted in descending and time in ascending by karthik7887

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