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* Computing of relative deltas (next month, next year,
next monday, last week of month, and a lot more);
* Computing of relative deltas between two given
date and/or datetime objects;
* Computing of dates based on very flexible recurrence rules
(every month, every week on Thursday and Friday, every
Friday 13th, and a *LOT* more), using a superset of the
iCalendar RFC specification. Parsing of RFC strings is
supported as well.
* Generic parsing of dates in almost any string format;
* Timezone (tzinfo) implementations for tzfile(5) format
files (/etc/localtime, /usr/share/zoneinfo, etc), TZ
environment string (in all known formats), iCalendar
format files, given ranges (with help from relative deltas),
local machine timezone, fixed offset timezone, and UTC
timezone.
* Computing of Easter Sunday dates for any given year,
using Western, Orthodox or Julian algorithms;
* More than 400 test cases.
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