How do you define "previous" in "previous business week"? I'm going to assume you want the last M-F in which the current day is not a member. 

use strict;
use warnings;

use DateTime     qw( );
use Text::CSV_XS qw( );

my $today = DateTime->today( time_zone => 'local' );
my $dow = $today->dow();

my $last_fri = $today->subtract(
    days => ( $dow <= 5 ? $dow-5+7 : $dow-5 )
);

my $last_mon = $last_fri->subtract(
    days => 4,
);

my $start = $last_fri->strftime("%Y%m%d00");
my $end   = $last_mon->strftime("%Y%m%d99");

my $csv = Text::CSV_XS->new();
while (<$fh_in>) {
    $csv->parse($_)
       or die("csv: " . $csv->error_diag() . "\n");

    my ($ts) = $csv->fields();
    next if $ts lt $start || $ts gt $end;

    print $fh_out $_;
}

[download]

In reply to Re: Extract data between certain dates using YYYYMMDDHH timestamp by ikegami
in thread Extract data between certain dates using YYYYMMDDHH timestamp by chud83

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