Pretty simple with the correct DateTime modules installed.
#!/usr/bin/perl
use strict;
use warnings;
use DateTime::Format::Strptime;
my $fmt = '%Y-%m-%dT%H:%M:%S.%3NZ';
my ($start, $end) = qw(2004-11-15T18:59:52.863Z
2004-11-15T19:09:52.972Z);
my $parser = DateTime::Format::Strptime->new(pattern => $fmt);
my $dt1 = $parser->parse_datetime($start) or die;
my $dt2 = $parser->parse_datetime($end) or die;
my $diff = $dt2 - $dt1;
print $diff->hours, " hours\n";
print $diff->minutes, " minutes\n";
print $diff->seconds, " seconds\n";
print $diff->nanoseconds / 1e6, " milliseconds\n";
--
< http://www.dave.org.uk>
"The first rule of Perl club is you do not talk about
Perl club." -- Chip Salzenberg
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