If I was going to write this, I would use Time::Piece and the code would look like:
#!/usr/bin/perl -wT
use strict;
use Time::Piece;
my $daysago = 28;
my $datadir = "/var/adm";
# MMDDYY of 28 days ago
my $timestring = localtime(time-$daysago*24*60*60)->strftime("%m%d%y")
+;
my $file = "$datadir/backup.$timestring.log.Z";
-e $file or die "File '$file' doesn't exist";
unlink $file or die "Couldn't unlink '$file'";
-Blake
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