I would like to do some arithmetic on time, dates and timezones. Could someone recommend the best approach and modules to use?

For example:

How many days between now and Christmas?

use Foo;
my $christmas = Foo->date(25, Foo->december(), Foo->today()->as_year()
+);
my $days_to_christmas = (Foo->today() - $christmas)->in_days();
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-Andrew.