At the moment I am using the DateTime-Module but I just reinstalled it on a new system and I am shocked on how much dependencies it pulls in.

Yes, DateTime is heavy but very full-featured. It is a trade-off (as is usual).

Luckily Time::Piece is in core and is almost a drop-in replacement for your simple script. I might not write it this way from scratch but have kept your method to show how analogous the two modules are.

#!/usr/bin/env perl 
use strict;
use warnings;
use Time::Piece;
use Time::Seconds;

my $td = localtime;

my $days_since_friday = ($td->day_of_week - 5) % 7;

my $days_to_subtract = $days_since_friday == 6 ? -1 : $days_since_frid
+ay;

$td -= $days_to_subtract * ONE_DAY;

print $td->strftime("%d%m%y");
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