From Date::Simple(3) man page:

Dates are complex enough without times and timezones.  This module may
be used to create simple date objects.  It handles:

Validation:
    Reject 1999-02-29 but accept 2000-02-29.
Interval arithmetic:
    How many days were between two given dates?  What date comes N days
    after today?
Day-of-week calculation:
    What day of the week is a given date?

It does NOT deal with hours, minutes, seconds, and time zones.

WWW: http://search.cpan.org/search?dist=Date-Simple

--
Alexey V. Antipovsky
kemm@in-line.ru