libdatetime-perl 2:0.4700-1 (i386 binary) in ubuntu karmic

 The DateTime.pm module aims to provide a complete, correct, and easy
 to use date/time object implementation. Currently it handles many
 date calculations, date math (addition and subtraction), and provides
 many convenient methods for retrieving portions of a date/time.
 .
 This module properly supports the Olson time zone database, meaning
 that historical time zone information, and more importantly, daylight
 saving time rules, can be handled transparently, simply by setting the
 correct time zone. This is done by using the DateTime::TimeZone
 module.