What is the recommended way of doing date arithmetics in Perl?
Say for example that I want to know the date three days ago from today (where today
= 2010-10-17
and today - 3 days
= 2010-10-13
). How would you do that in Perl?
You can use DateTime and DateTime::Duration
http://search.cpan.org/dist/DateTime/lib/DateTime/Duration.pm
Or work with unix timestamps:
my $now = time();
my $threeDaysAgo = $now - 3 * 86400;
my ($day, $mon, $year) = (localtime($threeDaysAgo))[3, 4, 5];
printf("Three days ago was %04d-%02d-%02d", $year+1900, $mon+1, $day);