1The core implementations for the DateTime.pm and DateTime::Duration 2modules originally came from Date::ICal and Date::ICal::Duration, both 3of which were written by Rich Bowen <rbowen@rcbowen.com> with help 4from the Reefknot team. Nowadays much of this code has been rewritten 5to the point that it is fundamentally original work. 6 7Parts of the API come from Time::Piece, by Matt Sergeant 8<matt@sergeant.org>, who had help from Jarkko Hietaniemi <jhi@iki.fi>. 9That API was originally created by Larry Wall. None of the code is 10shared. 11 12The DateTime::Locale functionality is based in part on the 13Date::Language modules that come with Graham Barr's <gbarr@pobox.com> 14TimeDate module suite. The strftime method in this module also 15borrows heavily from Graham's implementation. 16 17The week number and week year algorithms were taken from Steffen 18Beyer's Date::Calc module, but rewritten in Perl from scratch. 19 20The code for handling nanoseconds and the code for leap seconds were 21both largely written by Flavio Soibelmann Glock, who also has 22contributed various other features and fixes. 23 24Many others have helped out with code, ideas, and bug reports. See 25the Changes file for details. 26