This method appears to be a little bit slower, though neither seem all that "slow" to me. 16+ million iterations per second on my little powerbook seems plenty fast...

Are you sure this is the piece of your code that's slow? 

                   Rate ikegami code    bfdi code
ikegami code 16393443/s           --         -20%
bfdi code    20408163/s          24%           --

[download]
#!/usr/local/bin/perl

use Benchmark qw/ timethis cmpthese /;
use Date::Manip;
use POSIX qw/strftime/;
use Time::Local qw/ timegm_nocheck /;

sub get_using_date_manip {
    my $today_dt = &ParseDate("today");
    my $new_dt = &Date_GetNext($today_dt, 'Thu', 1);
    return &UnixDate($new_dt, "%Y-%m-%d");
}


sub get_using_posix_and_time_local {
    my ($sec,$min,$hour,$day,$mon,$year,$wday)
       = localtime();  # Defaults to now.

    $year += 1900;
    $day  += (7 - $wday + 4) % 7;

    $next_th = timegm_nocheck(0,0,0,$mday,$mon,$year);

    return strftime('%Y-%m-%d', localtime($next_th));
}



cmpthese(10_000_000, {
   'bfdi code'   => &get_using_date_manip,
   'ikegami code' => &get_using_posix_and_time_local,
});

[download]

In reply to Re^2: code to get the date for "next Thursday" by duckyd
in thread code to get the date for "next Thursday" by bfdi533

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