What? You're going to compare 16 lines of unrelated code (which contains a nasty loop) to a single line function and call it a benchmark victory? The OP was looking for a quick date time increment. His solution contained this and plenty of other code not directly related to the date time increment. If you're going to benchmark you won't get very far comparing apples to oranges.
By my benchmarking, the OP's "equivalent datetime increment" code is 144 times faster than DateTime and nearly as fast as Date::Calc.
use strict;
use warnings;
use DateTime;
use Date::Calc qw (Add_Delta_DHMS);
use Benchmark qw(cmpthese);
my $dt = DateTime->new(
year => 2011,
month => 1,
day => 1,
hour => 0,
minute => 0,
second => 0,
);
my ($year, $month, $day, $hour, $min, $sec) = (2011, 1, 1, 0, 0, 0);
my ($mday, $mon, $wday, $yday, $isdst);
my $time = time();
cmpthese(
-1,
{
'DateTime' => sub {
$dt->add(hours => 1, minutes => 2, seconds => 3);
},
'Date::Calc' => sub {
($year, $month, $day, $hour, $min, $sec) =
Add_Delta_DHMS($year, $month, $day, $hour, $min, $sec, 0, 1, 2
+, 3);
},
'tsk1979' => sub {
$time += 3723; # 1 * 60 * 60 + 2 * 60 + 3
($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) =
localtime($time);
},
}
);
__END__
Rate DateTime tsk1979 Date::Calc
DateTime 2875/s -- -99% -99%
tsk1979 431483/s 14910% -- -18%
Date::Calc 526429/s 18213% 22% --
