1From Date::Simple(3) man page:
2
3Dates are complex enough without times and timezones. This module may be used to
4create simple date objects. It handles:
5
6Validation:
7    Reject 1999-02-29 but accept 2000-02-29.
8Interval arithmetic:
9    How many days were between two given dates? What date comes N days after
10    today?
11Day-of-week calculation:
12    What day of the week is a given date?
13
14It does NOT deal with hours, minutes, seconds, and time zones.
15