Well, without any specifics of your task you are basically asking for statistics on CPAN module usage. :)
I'd say that, considering the fact that most Perl programs deal with web and databases (at least throughout my experience), you will not waste your time if you'll brush through
. But that you already knew most probably. :) So, you might try something that works with dates, like
. Maybe, some database abstraction modules might do some good - check out
.
That is as far as I can go without specifics. :)