time2str() is in Date::Format and it doesn't need Date::Calc.

I don't see how an error can happen on Date::Calc because it is not used.

use strict;
use warnings;

use Date::Format;
#use Date::Calc qw(Add_Delta_Days);  ##not needed

my $date = sprintf(time2str("%D", time));
print $date;  # 01/19/24
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Update: check your line numbering