a bunch of cleanups to the datetime stuff in irssi
removed the _get_day and _get_month functions and replaced them with a _get_day_and_month function
avoided a need for local time_t's and instead made the _get_day_and_month function return it
avoided allocating memory when it wasn't necessary
/*
* A completely stupid plugin, inspired by a dumb conversation in #gaim
* and needing some light relief from 'real' work.
* Also as a tribute to our fearless project leader.
*
* Copyright (C) 2005-2008 Peter Lawler <bleeter from users.sf.net>