Though Date::Manip is a really powerful tool, as his author states in the documentation, it's nearly always an overkill to use it in simple tasks.

You should probably want to benchmark Date::Manip with other modules like Date::Calc with the Delta_days() function, which might be what you're looking for.

Update:

I just benchmarked both module and Manip is really slower than Calc (but remember that Calc is not 100% Perl, and Date::Manip parses each time the dates we provide)

Here's the code and the results of the Benchmark, if anyone wants to optimize, criticize, or bencmark with other module:

$d1 = '14', $m1 = '08', $y1 = '2001';
$d2 = '16', $m2 = '12', $y2 = '2001';
$dt1 = "2001/08/14";
$dt2 = "2001/12/16";

timethese(-10, {  # running for at least 10 seconds
            'Calc' => \&Calc,
            'Manip' => \&Manip,
        });

sub Calc {
    my $Dd = Date::Calc::Delta_Days($y1,$m1,$d1,$y2,$m2,$d2);
}

sub Manip {
    my $date1=Date::Manip::ParseDate($dt1);
    my $date2=Date::Manip::ParseDate($dt2);
    my $flag=Date::Manip::Date_Cmp($date1,$date2);
}

[download]

The results:

Benchmark: running Calc, Manip, each for at least 10 CPU seconds...
Calc: 12 wallclock secs (11.04 usr +  0.00 sys = 11.04 CPU) 
      @ 142935.85/s (n=1577440)
Manip:10 wallclock secs (10.56 usr +  0.00 sys = 10.56 CPU) 
      @ 104.88/s (n=1107)

[download]

Is this making Date::Calc 1300 times faster than Date::Manip?

-- Briac

<kbd>--
PerlMonger::Paris(http => 'paris.pm.org');</kbd>

In reply to Re: Date comparisons + Benchmark by OeufMayo
in thread Date comparisons by cajun

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