How many days between 2 DTs?

[Max Campos]

Well, here we go again with DateTime::Duration.
Here's a simple problem - How many days are between two DateTime's ?  
Here is my attempt, but it fails.

Suggestions?
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use DateTime;
my $tz = "America/Los_Angeles";
my $dt = new DateTime(
                year => 2004,
                month => 9,
                day => 25,
                time_zone => $tz);
my $now = DateTime->now(time_zone => $tz);
my $today = $now->clone->truncate(to => 'day');
my $day = $dt->clone->truncate(to => 'day');
printf("Number of days: %s\n", ($day - $today)->in_units('days'));
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[EMAIL PROTECTED] ~]$ perl foo.pl
Number of days: -4
[EMAIL PROTECTED] ~]$
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- Max