A quick CLI reference for perl people…

perl -e ' my @t=localtime(time() + $ARGV[0]*24*60*60); $t[4]++; $t[5]+=1900; print "$t[4]/$t[3]/$t[5]\n";' XX

I’ve needed this 2x today already, and hope it helps you!

Someone made a comment, as people on the internet are prone to do, so here’s the long-form non-one-liner version:

my $addDays = shift;
my ($second, $minute, $hour, $day, $month, $year, $dayOfWeek, $dayOfYear, $daylightSavings) = localtime(time());
my ($fsecond, $fminute, $fhour, $fday, $fmonth, $fyear, $fdayOfWeek, $fdayOfYear, $fdaylightSavings) = localtime(time() + $addDays*24*60*60);

#fix 0 = 1 values, and "0 = 1900" problem:

print "today is: $month/$day/$year\n";
print "$addDays days from today is: $fmonth/$fday/$fyear\n";

Run it as:

rob@laptop:~$ fdate.pl 50
today is: 1/25/2012
50 days from today is: 3/15/2012