You claim this is your code:
use strict;
...
sub compare {
$a =~ /(\d{2})\/(\d{2})\/(\d{4})/;
$c = $3 . $1 . $2;
$b =~ /(\d{2})\/(\d{2})\/(\d{4})/;
$c = $3 . $1 . $2;
$c <=> $d;
}
However there are no default variables $c or $d so your code would not run.
The fact that you assign the two compound numbers to the same variable may be your issue, use warnings; would have noted this.
print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."
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