in reply to
Re^3: Timezone conversion in Perl
in thread Timezone conversion in Perl
Well, that section more or less predates the DateTime project, to the best of my knowledge.
Date::Manip is quite slow, but the DateTime project has never made speed anywhere near as high a priority as correctness, completeness, and having a sane API.
The original poster didn't make it entirely clear what he wants to do, but the Perl Advent calendar article mentioned in another post is a decent pointer for using DateTime is a good start.